Malicious PDF — malware analysis report

Static analysis result for SHA-256 4312528352413117…

MALICIOUS

PDF

84.2 KB Created: 2021-03-05 10:55:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1e7e52513a513599fdf845a14a251d76 SHA-1: 06927e00210adab169de9ff54c378a5ba092faf3 SHA-256: 43125283524131172b5973e4f636b8b2bc4890decd72530ee30230234c061387
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains a question about disposing of ink cartridges, likely a lure to disguise the malicious intent. The presence of multiple critical heuristic firings, including PDF_MALICIOUS_REDIRECTOR_LINK and CLAMAV_DETECTION, strongly suggests malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wb?keyword=how%20do%20i%20dispose%20of%20epson%20ink%20cartridges In PDF document text
    • https://nematoluzi.weebly.com/uploads/1/3/1/4/131409841/fewidamijujawuminuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387703/normal_5ffcc309e3383.pdfIn PDF document text
    • https://wezisaveveto.weebly.com/uploads/1/3/3/9/133999444/famiran.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465690/normal_60386a6465910.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/oidpggw/kitane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_6009e54fc16cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413719/normal_5fedef1c2a89b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490121/normal_600b7b8cc65d0.pdfIn PDF document text
    • https://fatomomome.weebly.com/uploads/1/3/1/6/131606630/binowajuralisoxo.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/hMhfHDC/best_mobile_fortnite_controller_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_5fd17622a9e30.pdfIn PDF document text
    • https://winiwezunubesu.weebly.com/uploads/1/3/1/3/131379740/6393792.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369912/normal_5ff25fe36d888.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/panokojol/bulk_sms_sender_software_free.pdfIn PDF document text
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_5cbf6d50cda94ed1ba3a77707789fb17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/memexelu/54846510696.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/algebra_solving_equations_worksheet.pdfIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_101a9ac449654706b1db170e347cb241.pdf?index=trueIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_d48efb544a79429c9b791974b6d35a7e.pdf?index=trueIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_ce4686afd355415c8fe037600917ff23.pdf?index=trueIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_9e8a870883de49299cb8277dfad209f2.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 5408 bytes
SHA-256: 042a38c7b1d4fa1f7466200285265a183c3930641002d40b62a629ebf1fd312f
font_01_sfnt_off00011d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4C 11232 bytes
SHA-256: 2a9bc772e006e01be80d41e6423bee264ddfbb353b087dd7bc8a00413dc2d463

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