Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97d5b17c3903168…

MALICIOUS

PDF

98.5 KB Created: 2021-03-03 11:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f432cd800f35d2933c7c7b4b9797c257 SHA-1: 144152642bfd61b90945c1b88daae4c17e128be3 SHA-256: a97d5b17c3903168165b9349bbc9febc8919f019b490cffdbe5abc1dfc62fc40
194 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs observed is https://xajibur.ru/strik?utm_term=fresh+off+the+boat+season+2+episode+7+dailymotion. While no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://xajibur.ru/strik?utm_term=fresh+off+the+boat+season+2+episode+7+dailymotion PDF link annotation
    • https://lafefetakizin.weebly.com/uploads/1/3/2/7/132712235/kodul_nekajo.pdfIn PDF document text
    • https://kumemuwopix.weebly.com/uploads/1/3/4/7/134709330/2819350.pdfIn PDF document text
    • https://pazodozonevaken.weebly.com/uploads/1/3/4/6/134606284/885308.pdfIn PDF document text
    • https://nebuxegakox.weebly.com/uploads/1/3/4/4/134404726/364a72b10c9ab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472488/normal_600fea152efe0.pdfIn PDF document text
    • http://gisejol.iblogger.org/vajapolewerusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_6025903421f8c.pdfIn PDF document text
    • https://jojuvuzi.weebly.com/uploads/1/3/1/8/131871720/2129792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_6010dda72d63c.pdfIn PDF document text
    • https://cdn.sqhk.co/jifegusewe/EHyXijb/mini_vision_rc_glider.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/jcchchf/siren_head_sings_dance_monkey.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/ihhdMRO/42737966675.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/Siaijid/ritolovavofudobosasokak.pdfIn PDF document text
    • https://cdn.sqhk.co/ritapabinap/rztyBjh/ghost_guns_legal_in_canada.pdfIn PDF document text
    • https://javisifuwo.weebly.com/uploads/1/3/5/3/135304639/mizukojoku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/27511453965.pdfIn PDF document text
    • http://nuxumejaxumem.epizy.com/casio_fx_115es_plus_square_root_decimal.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/45479672205.pdfIn PDF document text
    • http://rovafitazilom.epizy.com/frigates_fiji_surf_report.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_off000140f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F9 5688 bytes
SHA-256: 49afd698744ff2c41f0e54e374a84099b954ef0d8dc309dc912fa800c6f9a432
font_01_sfnt_off0001543a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1543A 11824 bytes
SHA-256: 40b0df5c60155fe5889762ce1335f4f92c7f3bd83baf3e3824a4ed29b2c2b36f

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