Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fe651ee9767a55…

MALICIOUS

PDF

109.2 KB Created: 2021-04-21 20:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14aac6f0f3daaea81199945ae001564f SHA-1: 18cbf21f8c0aa3198c6df4322cedb1e196992df3 SHA-256: 31fe651ee9767a559bd2532fbfebe5fb1ac7417249f7d8890f6d15d2a83bfa1e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common technique for distributing malware or conducting phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to lure users to malicious content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/strik?utm_term=merchant+of+venice+shylock+monologue
    • https://cdn.sqhk.co/dogovonediwa/6igr3hf/kritarchy_definition_webster.pdf
    • http://venatavokawudo.iblogger.org/ace_banking_and_static_awareness_book_free_download.pdf
    • https://cdn.sqhk.co/matikefateri/FiaFjgd/37199918238.pdf
    • https://cdn.sqhk.co/jimumakevaji/jfvF5nb/vh1_behind_the_music_metallica.pdf
    • https://cdn.sqhk.co/wozejodes/HSifiek/nizixisarifujipi.pdf
    • https://cdn-cms.f-static.net/uploads/4385847/normal_6021cbed3a38f.pdf
    • https://cdn-cms.f-static.net/uploads/4388428/normal_603f0861b8a62.pdf
    • https://cdn.sqhk.co/temejikowewa/ePsjjhj/gozulafubutubowavizeliw.pdf
    • http://ritixabig.iblogger.org/74501477799.pdf
    • https://static.s123-cdn-static.com/uploads/4475854/normal_5fcaf0f18c33f.pdf
    • https://cdn.sqhk.co/dosakupu/RywhgYd/94957370819.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_b2fe66a69ce049a1b6e9d8824d4f40bc.pdf?index=true
    • http://wuwovedivaz.rf.gd/cydia_12._4._2.pdf
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_c5eae32ce98f4516b125080cc97e25dc.pdf?index=true
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_0d87cf7234e44882a051759d796a0c16.pdf?index=true
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_0604bbdf90954a97bbf2d794aa38262a.pdf?index=true
    • http://sosubixoza.rf.gd/comics_buyer_s_guide.pdf
    • https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_1a838a67677b4ed3b78359a30d3eaf10.pdf?index=true
    • http://xerowavu.rf.gd/55886487243.pdf
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_6bf6638cc69a420690de593af3ebe09e.pdf?index=true
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_52fba0ae1d714033bc39d562eab7c616.pdf?index=true
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_6bc496d227b94c2e8399b2676d35c419.pdf?index=true
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_6ad1410b61264a60b20898987b129fbd.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_off00016ba7.bin
e9bf8b15e9bbd0539006ce8e548b8c974d9e6e233b1ebcab1b034adc73d9dc5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16BA7 5528 bytes
font_01_sfnt_off00017e6b.bin
b90996adb938d048cfa5b79b582ac39e848eb551a3e78bd61c594959743869be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17E6B 12132 bytes

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