Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7941b340b4e3125…

MALICIOUS

PDF

83.9 KB Created: 2021-03-18 03:06:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f9ad3a2519eee5e28d02cf02da5dae8b SHA-1: a29b673fa263765ad9f1fd45e7a277c8cea093da SHA-256: c7941b340b4e31256c26d39739339ec9b50765d63f0e966227f6b3217825c87e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it is part of a link farm operation. The primary external URL observed is https://golowaki.ru/award?keyword=role+of+biotechnology+in+food+production+pdf, which is likely used to drive traffic for SEO or phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://golowaki.ru/award?keyword=role+of+biotechnology+in+food+production+pdf PDF link annotation
    • https://mokowevabib.weebly.com/uploads/1/3/0/7/130739664/vobupemililokojedodi.pdfIn PDF document text
    • https://cdn.sqhk.co/jojevirelo/NL3egik/53075294660.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/jojenusupidunodavofuduvo.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/brother_intellifax_1270e_manual.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/vudupogiludodozaba.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/16355186530.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/gXjit58/64562722371.pdfIn PDF document text
    • https://sebuvijanamo.weebly.com/uploads/1/3/4/8/134856810/2437920.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/cncjb59/97396622484.pdfIn PDF document text
    • http://vebuwovivulab.mygamesonline.org/57299486764.pdfIn PDF document text
    • https://xexonuza.weebly.com/uploads/1/3/4/3/134305788/4f0ed23.pdfIn PDF document text
    • https://fobuxowomi.weebly.com/uploads/1/3/4/2/134235628/gonebax-wamiforu-pufadovudufazap.pdfIn PDF document text
    • http://budivev.scienceontheweb.net/oster_duraceramic_double_flip_waffle_maker_instructions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_2c8aaa7de67046e38e58c0b08d0dd11c.pdf?index=trueIn PDF document text
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_c9181601d9c0489e9d4a1e4b7e2fd901.pdf?index=trueIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_023ffb01b4874c979f88378fb7b2df97.pdf?index=trueIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_6436f9a55ea64b35ba54a22581b8fe2c.pdf?index=trueIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_403ac99b05f144c7a618a099ca3d0918.pdf?index=trueIn PDF document text
    • http://wumugajus.onlinewebshop.net/tidam.pdfIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_5d4b6b2518f54056a1eaae24c0d99d20.pdf?index=trueIn PDF document text
    • https://07305246-6d94-4033-9ce1-ead17dc2a1c9.filesusr.com/ugd/c4ccc4_8ed81eb0fe6d4cc0ab379831de12c94b.pdf?index=trueIn PDF document text
    • http://piwolimosopobu.myartsonline.com/9049351421.pdfIn PDF document text
    • http://watusatuvor.myartsonline.com/duxojiradasor.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_7874777208df42bbbf46ea148c7dd912.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_off0000fcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 5280 bytes
SHA-256: f8dee312ba0aa5ff6383ae001f21515f907e2400d592e8ab2dd52e4b381501ed
font_01_sfnt_off00010ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 2444 bytes
SHA-256: 4ea38419097e49272ec778b1355f4fa708766a94f0f8a88bb8c5c8b6288ebd17
font_02_sfnt_off00011954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11954 11640 bytes
SHA-256: 54779c825dbb74f70f40760f22d8653dbfac2dd690bc235f3115b1fc972b04dc

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