Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e20ad4105f381e1…

MALICIOUS

PDF

92.9 KB Created: 2021-03-09 19:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0437f8b7c4404808d0a0d18531055524 SHA-1: d941f9966061089769e436262abdaed4fd62a8bc SHA-256: 4e20ad4105f381e1938488bad2be14fca8ef67b516ea5a353108291b4df17b63
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains text related to 'jurnal addison disease pdf', indicating a lure to attract users searching for this topic.

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://gimoguvi.ru/award?keyword=jurnal+addison+disease+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482219/normal_5ff6bd937f25a.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/pukal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391898/normal_60063e106d73d.pdfIn PDF document text
    • https://zogomidovuga.weebly.com/uploads/1/3/1/6/131636914/xibedokugunoni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451352/normal_5ffe60f1b5901.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/jipegigobudos-vesomelukino-zimuwofevor-tuluxitejif.pdfIn PDF document text
    • https://fokinovev.weebly.com/uploads/1/3/0/7/130775288/kobotir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470699/normal_60121dda9b315.pdfIn PDF document text
    • https://jujizifij.weebly.com/uploads/1/3/4/3/134309807/rafubu-pepasuzox-rogegaken.pdfIn PDF document text
    • https://felavutiz.weebly.com/uploads/1/3/1/1/131164211/049a79d1cc5a.pdfIn PDF document text
    • https://mofizuzu.weebly.com/uploads/1/3/4/3/134316779/873872.pdfIn PDF document text
    • https://vuzigalami.weebly.com/uploads/1/3/5/9/135960382/lodaramifabekevub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_602187ba0c0f5.pdfIn PDF document text
    • https://zofitete.weebly.com/uploads/1/3/2/7/132740948/7540633.pdfIn PDF document text
    • https://nisazixipa.weebly.com/uploads/1/3/0/7/130775104/pusejumixuxulila.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/masevewi/19824546704.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/mathematics_for_economists.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/citing_website_mla_format.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_off00012f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F33 5024 bytes
SHA-256: f0fbb15e65265618271428344ae3a47a1734c2de2132cd88bcff2d1d6bd3688e
font_01_sfnt_off0001405a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405A 11580 bytes
SHA-256: 0b8252d1ae779197f78d0062a01200d75b8938321b6fd7cf4748969c84384c79

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