Malicious PDF — malware analysis report

Static analysis result for SHA-256 96afcd78a94e205b…

MALICIOUS

PDF

87.0 KB Created: 2021-02-15 21:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 41934c895ad90fbc8948587fecb7347d SHA-1: 304b6accc289626946093b199570919f850bab8f SHA-256: 96afcd78a94e205b7b4681eb619afb32eed2a171df4b1ff98fa0ff336663a59a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=integral+calculus+formulas+exponential PDF link annotation
    • https://koxidofajutu.weebly.com/uploads/1/3/5/9/135971573/1842926.pdfIn PDF document text
    • https://ketevifut.weebly.com/uploads/1/3/1/4/131453005/metonuxomud_kawib.pdfIn PDF document text
    • https://mulofujuxemo.weebly.com/uploads/1/3/0/8/130874025/781777dd7b.pdfIn PDF document text
    • https://tepidupelagoxu.weebly.com/uploads/1/3/4/4/134472529/daxufuriluxaxajimij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405208/normal_602a09bb79a6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489976/normal_5fe61b7389cbc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://furizebun.epizy.com/animated_background_gif_free.pdfIn PDF document text
    • http://fiwusinuba.rf.gd/54289279064.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/wofabawelavofixaratusanow.pdfIn PDF document text
    • http://vaguwiraji.rf.gd/acinetobacter_treatment.pdfIn PDF document text
    • http://vaxesopubowutuf.rf.gd/bagarijetimapipos.pdfIn PDF document text
    • http://vewetumizobu.rf.gd/tepakabebu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 5340 bytes
SHA-256: 476d82ca4bcf32931ea064023cd897ad5f14bca4ca6883eb9c82e2fc2069637a
font_01_sfnt_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 12076 bytes
SHA-256: 6fc01844705b5cbf7f08370d11ab50d9bb34ce68f00283940e6330c5e04730fc
font_02_sfnt_off000137db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DB 16136 bytes
SHA-256: 044b73322d06dfdef6906b533e442780aeb9c704f6b8eb2eba6d09437143be8b

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