Malicious PDF — malware analysis report

Static analysis result for SHA-256 85aec2881bdac220…

MALICIOUS

PDF

66.8 KB Created: 2021-04-02 19:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b2393629194e959e10915380b6874f0 SHA-1: 6077395beb0def943649c045d6dc23a9dd274c54 SHA-256: 85aec2881bdac22029522d23645a2bcb198e54d1795a180a5693436bde02a649
156 Risk Score

Malware Insights

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

This 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 pointing to 'https://seumenha.ru/strik?utm_term=moon+river+pizza+hours'. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through a network of linked PDFs.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=moon+river+pizza+hours
    • https://cdn-cms.f-static.net/uploads/4393790/normal_60666b1860f78.pdf
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/1326489.pdf
    • https://cdn.sqhk.co/jojojidatun/VijGqgd/45620300021.pdf
    • https://static.s123-cdn-static.com/uploads/4407983/normal_5fc56f1c0d25c.pdf
    • https://cdn.sqhk.co/watexoba/gSWhcf6/candidiasis_en_hombres.pdf
    • https://jewuvasoseximu.weebly.com/uploads/1/3/4/3/134355154/fafowefubemu.pdf
    • https://cdn.sqhk.co/kewawukufiju/gjjVmge/6795871094.pdf
    • http://mediaverifiedbadge.com/canon_pixma_mg5320_wireless_printer_setup63xfx.pdf
    • https://cdn.sqhk.co/nuvexajamu/e5hct0v/48368321199.pdf
    • http://trendmobile.ru/minecraft_mod_aether_portal2b69o.pdf
    • https://cdn.sqhk.co/ramawuvade/7jcghha/xenodepomefovefovo.pdf
    • https://cdn.sqhk.co/fupupusamun/fsaxq7v/vaziri.pdf
    • http://podarokinsta.site/yandex_mail_app_for_mac5jhx3.pdf
    • https://static.s123-cdn-static.com/uploads/4369908/normal_5fcad74238742.pdf
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/sifek.pdf
    • https://cdn.sqhk.co/sabepakofo/cJibphf/wild_kratts_world_adventure.pdf
    • https://static.s123-cdn-static.com/uploads/4481409/normal_5ffacb7a254f3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_6f760e606a934ca4ad46f4af12dae2eb.pdf?index=true
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_4dc4eef5d13f470aa9a08fe788f2993c.pdf?index=true
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_0419bc9e62c64f4c8588ef675d0c8f4a.pdf?index=true
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_b8b2280b3ef246a890572e340986e7ae.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_off0000c960.bin
ceeaf444133a5e6ec731881f9e2ebc7638a1ce087d5fd54b2ef4ea2240a70ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC960 4988 bytes
font_01_sfnt_off0000da6c.bin
69d6039270fc773189de0bd7ae8e43fe0b5201c85bc036e68d3830cef3e3bfa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 10500 bytes

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