Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30963cae22ec5ac…

MALICIOUS

PDF

78.9 KB Created: 2021-02-22 06:56:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e46ba1022a596e5c5b36fa5630888c4c SHA-1: 9c906b2755ee946a6d41c67e8ee17b6a6f18405a SHA-256: a30963cae22ec5ac3ee20a2e88fc8d359ea752510d420c94d81f2c22cf70fb40
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or redirecting users to phishing or malware sites. The presence of numerous external links suggests an attempt to drive traffic or distribute malicious 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://leonvi.ru/123?utm_term=veterans+clothing+donation+drop+off+near+me PDF link annotation
    • https://tewamuwomipatus.weebly.com/uploads/1/3/0/9/130969874/fakane_lulitazifanara_mopumozimez_numedo.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/d58a30.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/ae299bo/64482131900.pdfIn PDF document text
    • https://sorudexene.weebly.com/uploads/1/3/1/3/131384015/pulalex.pdfIn PDF document text
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/a2c46.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/TgfBieC/gepovamodepawukotexuj.pdfIn PDF document text
    • https://jojurofi.weebly.com/uploads/1/3/4/6/134666092/pifikiwodogaxap.pdfIn PDF document text
    • https://rizibibaruf.weebly.com/uploads/1/3/5/3/135383358/kisusowijad-gojenomezux-sabuxagiv.pdfIn PDF document text
    • https://vijopafixav.weebly.com/uploads/1/3/1/6/131636601/misawupavewamu-rosojukekinekun-betuki-senewitesosig.pdfIn PDF document text
    • https://kiwotatuna.weebly.com/uploads/1/3/1/8/131856308/9854242.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/veraxawewib/power_of_attorney_template_india.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/bully_ps2_english_class_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/kizalopiniwojerixes.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_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 5532 bytes
SHA-256: 527785bbc14b8d21d4efe9f9f56882448c846de204212c25a534f3a2277dbcfa
font_01_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 10720 bytes
SHA-256: 477cd239475927be18e6dedfd4ffc73c40b30b74017195ac7ad129e775e1cd9c

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