Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b919c407510893…

MALICIOUS

PDF

113.6 KB Created: 2021-03-09 17:20:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4dbd02499f0ce3d232d50ddd9ace9886 SHA-1: 450a6758eb7206c24f0588ead77b6d58be1d6298 SHA-256: a6b919c407510893eb1db1058a639fd8dca920c005aef1e75bf05ffb933f22f8
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is classified as malicious and contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a fake browser extension or update, a common tactic for malware delivery or credential theft. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/123?utm_term=view+android+messages+on+computer PDF link annotation
    • https://bilimetib.weebly.com/uploads/1/3/4/4/134435282/musevebewobeno_gipugibu_jesisukowijakuv_segumugevuxuki.pdfIn PDF document text
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/9002893.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/beats_studio_4_price.pdfIn PDF document text
    • https://dunofedipusafo.weebly.com/uploads/1/3/4/4/134477286/b757bba.pdfIn PDF document text
    • https://pogipusuzifu.weebly.com/uploads/1/3/4/8/134869227/denukinosu.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/tiwiwagale.pdfIn PDF document text
    • http://mokaxizekebade.scienceontheweb.net/pejamefegeju.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/83ebc1.pdfIn PDF document text
    • https://fixafaren.weebly.com/uploads/1/3/0/7/130738550/2231619.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/how_to_make_friends_and_win_influence.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/4036234.pdfIn PDF document text
    • http://tokudujadi.medianewsonline.com/6411420830.pdfIn PDF document text
    • https://ronojunigamedez.weebly.com/uploads/1/3/5/2/135297775/4c4c12fc4b4.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/nonix.pdfIn PDF document text
    • https://zupagefu.weebly.com/uploads/1/3/1/0/131070313/gorewiwewavewus-jewanubililekas-riritekejeda-gefuwosorara.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/sogolipexalapabave.pdfIn PDF document text
    • https://nijumaweka.weebly.com/uploads/1/3/1/3/131379182/folubas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_2826e6657a24419eb63d01f020c32778.pdf?index=trueIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/manual_software_testing_jobs_in_melbourne.pdfIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_afeb659437844adda9a57fe82c911aee.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_f2cff7035da44588befad021f1ea8271.pdf?index=trueIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_b134831aa3c340988454c75f412a16b5.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000174d9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x174D9 26204 bytes
SHA-256: f92f3ce8d2376e184b96ab4d488199c7c17616679a803966170ccac2877a1a0e
font_00_sfnt_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 16816 bytes
SHA-256: f97028f16378119288e996f5d65c8b4154c31f31299d1760071ca849087dee33
font_01_sfnt_off00011f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 5416 bytes
SHA-256: b8cdc7722e8c641d6d711dc02272473b762e5cffd69ba3e10c084499782d4c48
font_02_sfnt_off000131cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CF 10832 bytes
SHA-256: 93d463da632bf02ec730412728b900c1d04d3b99542c70f178071797da887012
font_03_sfnt_off00015032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15032 10980 bytes
SHA-256: 51ac3a6cd7bacba99e8b40d4f4743f54f129638dc6a69ef0234c0de16a8f0818
font_05_sfnt_off0001a2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2BC 5076 bytes
SHA-256: c55c031b7ce53d1644610513ca893df29246a8fc6fe985b4340f1807191b2da3

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