Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e85214e5698137…

MALICIOUS

PDF

125.9 KB Created: 2021-03-01 11:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b85073f08b48e1f7eb43e2ea0d89039f SHA-1: 26ca01012e5d7d97e08439acaa193d0f7957a32f SHA-256: 61e85214e56981376651856222d4ff19c252f32f73dbae47715b46bf8d3ecd28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. One of the primary external links points to 'maypoin.ru', which is suspicious. The document body is heavily obfuscated, but the presence of external links and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document is designed to redirect users to malicious sites, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://maypoin.ru/123?utm_term=introduction+to+american+deaf+culture+online+textbook+pdf
    • https://cdn-cms.f-static.net/uploads/4409123/normal_5fe9c72d15c4f.pdf
    • https://static.s123-cdn-static.com/uploads/4493610/normal_5ff570a11f111.pdf
    • https://static.s123-cdn-static.com/uploads/4470683/normal_5fcfb0d19ebb9.pdf
    • https://cdn-cms.f-static.net/uploads/4463526/normal_5fdae2831e3ca.pdf
    • https://cdn-cms.f-static.net/uploads/4486213/normal_5fe784d34e4f2.pdf
    • https://static.s123-cdn-static.com/uploads/4368732/normal_5febf2d9e8c43.pdf
    • http://lighterusb24.site/free_slots_machine_in_italiano_gratisqst30.pdf
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5fd65fdb691e9.pdf
    • http://detonic-deutschland.website/sewuvugidujajo2t6o.pdf
    • https://cdn.sqhk.co/detazido/hVighgc/66014156740.pdf
    • http://texno3ua.com/vemobopedidenugqv07.pdf
    • https://static.s123-cdn-static.com/uploads/4467577/normal_5fdeebb69e1b0.pdf
    • https://zuvigopujipo.weebly.com/uploads/1/3/0/9/130969218/wawuzomimitezupusot.pdf
    • https://xodumusekow.weebly.com/uploads/1/3/4/7/134708755/jegopiziwuravo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bovenotojitowe/playstation_gold_headset_cutting_out.pdf
    • https://s3.amazonaws.com/sifawekujiki/indian_railway_ticket_booking_form.pdf
    • https://s3.amazonaws.com/lomogas/good_reader_android.pdf
    • https://s3.amazonaws.com/bisute/tiletenese.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a3df.bin
3c6502e04658d985b37ed967139d4b1bb7136c1c8ff06868e6b64c17630b7d50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3DF 2960 bytes
font_01_sfnt_off0001ae62.bin
88dfb965f7b93f26de5f39009a58c9fee2eb5a491d3ebb72c5d98002ca0096d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE62 5332 bytes
font_02_sfnt_off0001c06e.bin
48c728683aa22b05b9b87b98f26f656cd1104d17c3f14f11a046267fc25b2b70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C06E 12156 bytes

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