Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7ba63ec2a78f47…

MALICIOUS

PDF

81.1 KB Created: 2021-02-26 23:37:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: cf93a1beac4e18484cf535c8b591fea1 SHA-1: 6f3a223fb41cee1f0e416712faa42c55b935fbd0 SHA-256: 3a7ba63ec2a78f473ddcd705e9eeb264a95ec0943ae82b82f9e037577c358c49
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=sword+art+online+progressive+volume+4+pdf PDF link annotation
    • http://songkfrk.site/gilan0vtey.pdfIn PDF document text
    • http://lireveputejat.iblogger.org/sojibogesoboxaxojomev.pdfIn PDF document text
    • https://cdn.sqhk.co/jetobatu/PvIpvhe/physics_class_9_chapter_2_ncert_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/hijBIgj/95125201565.pdfIn PDF document text
    • https://degupapaji.weebly.com/uploads/1/3/0/8/130814014/jusuwab.pdfIn PDF document text
    • https://bukalejobiwasek.weebly.com/uploads/1/3/1/4/131409200/7176120.pdfIn PDF document text
    • https://kodusikur.weebly.com/uploads/1/3/1/6/131606179/wubat.pdfIn PDF document text
    • https://cdn.sqhk.co/xavipinav/ieiihep/lynx_vs_house_cat_size.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/iitiAiq/rudofo.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/4jb1bBs/change_lock_screen_shortcut_mac_mojave.pdfIn PDF document text
    • http://wefabawatewe.22web.org/thorie_des_avantages_comparatifs.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/DibhhcN/5552413192.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rizibapuzaduxe.epizy.com/99280322289.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/16743620312.pdfIn PDF document text
    • http://kakafemapekumu.epizy.com/bartleby_el_escribiente_descargar.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 5704 bytes
SHA-256: 793d6b8055fac2b71aa53b046a4a9e68d4fde2967a2d631dabfdb900667d35c6
font_01_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 10536 bytes
SHA-256: 3cd741f421c83aa8136d281695d27def441c493bed08740be2f73082498295e6

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