Malicious PDF — malware analysis report

Static analysis result for SHA-256 732a367d3e462dac…

MALICIOUS

PDF

79.0 KB Created: 2021-03-30 02:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1eaf2e851cd05d42717c7cea35628977 SHA-1: 46f2ea39dcf54a67bf120fe5dfb41dd35d9b8fa6 SHA-256: 732a367d3e462dacce97ca70e487847e0975ee15538eb52d650d15a14a46a733
202 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 ML classifier and ClamAV detection. It contains a link farm with numerous external URLs, suggesting an attempt to redirect users to malicious content. The presence of invoice and download button lures further supports a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a high likelihood of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/award?keyword=ap+module+grade+10+3rd+quarter+pdf PDF link annotation
    • https://cdn.sqhk.co/zexukobesu/Wp3nihY/34243200414.pdfIn PDF document text
    • https://pusazaninad.weebly.com/uploads/1/3/4/3/134358808/3633822.pdfIn PDF document text
    • https://feminudusur.weebly.com/uploads/1/3/1/4/131407357/tupumaseruxu.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/jPhbGjf/vuwogonefodokuzokodifidob.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/hfjuVvL/nevepenivenofedo.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/mjeN8hg/princess_cake_designer_chef_baking_cooking_games.pdfIn PDF document text
    • https://niforowekid.weebly.com/uploads/1/3/1/4/131406966/vurikidatajevi.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/4038066509.pdfIn PDF document text
    • http://pinenud.mygamesonline.org/kojugowol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rutufokedizon/durable_general_power_of_attorney_form_ny.pdfIn PDF document text
    • http://tabasisexiga.rf.gd/global_agricultural_machinery_market.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_ff8d1b383a82401cb9ec18fabdfcbf81.pdf?index=trueIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_d9550aae7dba46d8b39218c87322f704.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/47657370051.pdfIn PDF document text
    • http://riwekijeworore.rf.gd/writing_concise_sentences_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/the_complete_book_of_numerology_tiki.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_22c6b39f96bf430385aa20dd886bf3df.pdf?index=trueIn PDF document text
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_b3cb0ee5ecf44cca97e4242c9474a4d1.pdf?index=trueIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_315df9469bc4436686e3c128b56e02ac.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 5384 bytes
SHA-256: 88e271a07bfe78a3f0617932cb1b5de4c7dfed1684771e25a8eba0b69e675c1a
font_01_sfnt_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 10128 bytes
SHA-256: b07400ae2442e6af4f271ba49ff41d437dfd81c93cbdb041dad457c6f321c04a
font_02_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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