Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b59a059bfefe674…

MALICIOUS

PDF

79.4 KB Created: 2021-03-24 11:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9ed1c82b1680bed753ee092b14460041 SHA-1: b63231ab42edd04650f87e84659b4494e1110687 SHA-256: 3b59a059bfefe67464251031116a6ece17ea2838f06a33108764dcc9cc731aee
164 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous external links, many of which are likely part of a link farm designed to improve search engine rankings for unrelated content. One of the embedded URLs, 'https://gimoguvi.ru/wix?keyword=best+free+invoice+template+for+mac', suggests a lure related to invoices or payment, aligning with the 'SE_INVOICE_LURE' heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gimoguvi.ru/wix?keyword=best+free+invoice+template+for+mac PDF link annotation
    • https://kagukemo.weebly.com/uploads/1/3/4/8/134884413/8b28200ffa13.pdfIn PDF document text
    • https://cdn.sqhk.co/fogunedevare/pIaUBjj/idle_landmark_tycoon_mod_apk_money.pdfIn PDF document text
    • https://jinepesel.weebly.com/uploads/1/3/5/3/135346763/5738992.pdfIn PDF document text
    • https://muwalarole.weebly.com/uploads/1/3/5/9/135959937/2ca9559.pdfIn PDF document text
    • https://pavonaxasove.weebly.com/uploads/1/3/5/3/135310158/suzon.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/5342372.pdfIn PDF document text
    • https://tadilagene.weebly.com/uploads/1/3/1/3/131381422/ralulufofuno.pdfIn PDF document text
    • https://cdn.sqhk.co/redexisa/hgfjjgf/xamazoz.pdfIn PDF document text
    • https://vitafidazi.weebly.com/uploads/1/3/4/7/134728623/vivemowus_koradakej_mekebaw.pdfIn PDF document text
    • https://cdn.sqhk.co/gatuwaven/qiiOido/39805013611.pdfIn PDF document text
    • http://womanaratiso.iblogger.org/65950283088.pdfIn PDF document text
    • http://debagigitefofo.iblogger.org/slope_intercept_equation_from_graph_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf5b25a9-2591-43af-a7f7-a740f79b1119/walt_whitman_high_school_counseling_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08fc4d9f-4df2-47eb-a7eb-2b536438accc/1389573672.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/is_tesla_model_3_worth_the_price.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/epson_artisan_810_how_to_replace_ink_cartridges.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/simile_and_metaphor_worksheet_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/how_to_connect_hp_officejet_4500_desktop_printer_to_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7f8a1d-a75a-43ca-a84f-e5181d1acb52/examkrackers_mcat_2015_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de7024b-9686-4946-b2ce-e9434e06f865/fopodajadifut.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF767 5268 bytes
SHA-256: cfe7aebbed185a7a4ac223e26cdc21d7afd07bcca073216584ecd48c0b96b1d7
font_01_sfnt_off0001094a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094A 11396 bytes
SHA-256: 3960dbd65ce7071f7dabb7a46d087aef285e9e8e1a0637fe1d8a2dd9ec9f9dd1

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