Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fb55b7a7322a61…

MALICIOUS

PDF

91.4 KB Created: 2021-04-28 20:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c44682677733203bb59059bee243a347 SHA-1: 91407fe15a9ba817f9f64f9bff6c1d543e90ab86 SHA-256: d9fb55b7a7322a6136df2353535e539cd567b4750180a84c147b040aea4aec85
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://fokemale.ru/strik.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://fokemale.ru/strik?utm_term=nashville+number+system+pdf PDF link annotation
    • http://lalikexitaxixix.getenjoyment.net/company_organization_chart.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/free_printable_blank_bingo_cards_for_teachers.pdfIn PDF document text
    • http://gekiwejal.scienceontheweb.net/composition_of_local_anesthesia_in_dentistry.pdfIn PDF document text
    • http://silekutum.medianewsonline.com/24874524865.pdfIn PDF document text
    • http://fizarumokugafu.mywebcommunity.org/laxixiziradegaradej.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/burger_king_hamburger_bun_calories.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_f45e02540a2b42469fde7c9a292ab245.pdf?index=trueIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_57ff75832c384ce1a49539b160a92a6c.pdf?index=trueIn PDF document text
    • http://kurerori.myartsonline.com/88786709565.pdfIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_d9f27c779972443586edf6c233297880.pdf?index=trueIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_a2e10418da86405b985c941066a0672b.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_b97401cd76994931a1fa22ed3aa8aae3.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_7a88571361064428ac39ce064b30d373.pdf?index=trueIn PDF document text
    • http://kedisijusa.onlinewebshop.net/nojafoxikukofivafoxapu.pdfIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_79468a9702b444c7bcf42d536f6ce936.pdf?index=trueIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_9aab3c565037410a9010af5714874256.pdf?index=trueIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_97198770eb424c0fa3bd4d1e05004c3b.pdf?index=trueIn PDF document text
    • http://purezaviwof.myartsonline.com/ganpati_aarti_sangrah_in_marathi.pdfIn PDF document text
    • http://jitawidavez.atwebpages.com/list_of_algebraic_identities.pdfIn PDF document text
    • http://pezamax.myartsonline.com/what_is_a_5_percenter_in_law_enforcement.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_66de8b2fc1744a6da8ed3b73ae7174ed.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 5552 bytes
SHA-256: 1727ffb0a4d6b13a2b3fdf7d61087b1cdfcce65f6daf27aa4a2b36570917a983
font_01_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 12152 bytes
SHA-256: 3444713168a2e8c8c07fb03dcefeb865c4276d5599e16bee1103ec0b47a886e0
font_02_sfnt_off00014962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14962 16120 bytes
SHA-256: 15a68420f1c377824b8c1fd571ac7c30556db1b4bc05006bf44ec3f6c6c83208