Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f68a5c20cc5ba8d…

MALICIOUS

PDF

80.5 KB Created: 2021-05-11 13:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37c08f923cb65a1e185e2ad27cedb6d9 SHA-1: 7f3dc1c0dd73fbb95d2d299ac68ea66051bc6e15 SHA-256: 3f68a5c20cc5ba8d53822fca70ee7eef55f0d06dce64629f4bf53bac0432888a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains numerous external links, with one prominent URL being https://dafemum.ru/strik?utm_term=remington+chainsaw+parts+canada, suggesting a lure to a malicious site. The presence of PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO manipulation or to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=remington+chainsaw+parts+canada
    • http://gadosamu.iblogger.org/sunesululiwetofelal.pdf
    • http://nesorus.mywebcommunity.org/20782146167.pdf
    • http://lixebafevoku.mypressonline.com/94360704417.pdf
    • http://silozimerum.iblogger.org/99640571598.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_0291a08d3cd0439c8c2d385f2829fa2f.pdf?index=true
    • http://takugiwem.rf.gd/fevejowimejevamasadelid.pdf
    • http://satawakerexe.atwebpages.com/enfermedades_que_causa_el_sedentarismo.pdf
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_c7b842de71e641819fdfb0df411185ba.pdf?index=true
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_e86d3f7c0bd84bce822667dd1eeff1f0.pdf?index=true
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_79103639a0b14869b4c1dd81a492c5ef.pdf?index=true
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_b538cc832d5e480f9a093224711fe1e3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7cf6b862-6c86-4c73-958d-6e4edef2d677/vaxejibuzawi.pdf
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_f7dec05e2b104679b7bb7dcb10803890.pdf?index=true
    • http://gumomexad.onlinewebshop.net/what_is_the_money_cheat_code_for_gta_v.pdf
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_ba21632e04fd425492b51ee27849a888.pdf?index=true
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_8626f737c03542be9325c78296a602c0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3c77b8a3-f155-42ca-8368-4ed868a1d417/father_and_son_clothing_sets.pdf
    • https://uploads.strikinglycdn.com/files/1df94b09-d620-4588-96c1-1fc284ef2f0f/sulikexaxa.pdf
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_901f963498114e79854072971a7f7507.pdf?index=true
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_70a77b7a2dc3440eadb33a4e0298162d.pdf?index=true
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_aa61951e059343d0b776c2192748cf23.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd67.bin
3d6fffd6f978632d348e9444b571ba4fea05b2e9fe2570f261a274ae51b60b1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 5556 bytes
font_01_sfnt_off00011032.bin
5b6d658487fdfed07e21f76cd5c1729286138d6536059e287cd5ce19af0f1ebb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 10696 bytes

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