Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee2a31c2e723741b…

MALICIOUS

PDF

73.1 KB Created: 2021-02-21 19:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f8869a8a1036fe0fe06bb567a9035aaf SHA-1: e330b745d317287cb760119de67fdc8e3d6c00d1 SHA-256: ee2a31c2e723741bfa7a5a61361dcee70d43325650e56f6f979e037541baee3b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting and potentially serving as a lure for phishing or malware distribution. The presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest a malicious intent to redirect users to other sites.

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://seumenha.ru/123?utm_term=what+is+dbms+and+its+function PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479917/normal_5ffa2cd92854c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_6012e167a2654.pdfIn PDF document text
    • https://zipebamaxotunev.weebly.com/uploads/1/3/2/8/132814247/f1a3b111a67c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469350/normal_5ff18ea3ec033.pdfIn PDF document text
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/tuvubub.pdfIn PDF document text
    • https://nejotadig.weebly.com/uploads/1/3/1/1/131164569/xezumuzatoterulez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393514/normal_5fe721221fbd3.pdfIn PDF document text
    • https://basosogufu.weebly.com/uploads/1/3/4/6/134682995/bosiluka_zomabaguzuraxas_tafidupev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417809/normal_6015fc44c3fb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419851/normal_6012187b67925.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/joterige/spotify_mod_premium_terbaru_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/fusimigu.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/mithibai_college_online_admission_form_for_baf.pdfIn PDF document text
    • http://femejedad.epizy.com/ashampoo_snap_5_full_free.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_off0000e161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE161 5288 bytes
SHA-256: 7843c56d0a1c07072fcd0eaea0da38c305d56061099042ec7cf785bcfce80998
font_01_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 10576 bytes
SHA-256: 35304623f62341870b378375ea7ac4f673ff4519751461999795e019c3ceeb4f

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