Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cb6f1233cdcfdf…

MALICIOUS

PDF

86.1 KB Created: 2021-06-05 18:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca4022738d8f456c6082211b5b16a002 SHA-1: eaa8becaf8d8f8c5a1bb6d56814f6e4cd2dba043 SHA-256: 85cb6f1233cdcfdf1d8ad65b1f0aaa1146f006fe7dc337b8fef8eb546255ce22
186 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, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The primary URL suggests a lure related to legal terms, likely to attract unsuspecting users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://catamma.ru/pbw?utm_term=what+is+the+concept+of+anticipatory+bail
    • https://rategojo.weebly.com/uploads/1/3/0/7/130739688/xefubukemuvi.pdf
    • https://sekugarotapoze.weebly.com/uploads/1/3/4/3/134362520/mosawuvomepol.pdf
    • https://bematurom.weebly.com/uploads/1/3/4/8/134886193/1487996.pdf
    • https://wipevotabekux.weebly.com/uploads/1/3/1/6/131607119/3cb4f.pdf
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/felavanod-tiselatazif.pdf
    • https://zoxobafibo.weebly.com/uploads/1/3/4/2/134235835/defewus.pdf
    • https://taxezuwijukiwum.weebly.com/uploads/1/3/1/6/131606901/6b135f.pdf
    • https://nigefawami.weebly.com/uploads/1/3/4/5/134598638/2982261.pdf
    • https://bexejasofipa.weebly.com/uploads/1/3/1/3/131397997/kidudezomi.pdf
    • https://vezisadorudaruj.weebly.com/uploads/1/3/4/3/134349324/4062045.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kepojijudiva.pbworks.com/f/math_test_grade_9.pdf
    • http://bofamawetodo.pbworks.com/w/file/fetch/144570114/betipotizufegunevog.pdf
    • http://kunixove.pbworks.com/f/rubiks_cube_formula_3x3_telugu.pdf
    • http://fawugomem.pbworks.com/w/file/fetch/144646617/jetof.pdf
    • http://nowefuro.pbworks.com/w/file/fetch/144596583/jafudidexemogezarataxido.pdf
    • http://famukaser.pbworks.com/w/file/fetch/144652989/mesidexevemotagowinus.pdf
    • http://redelaw.pbworks.com/f/what_is_the_principle_of_iris.pdf
    • http://vawijoj.pbworks.com/f/34935513666.pdf
    • http://vazesuna.pbworks.com/f/blue_prism_mapiex_latest_version.pdf
    • http://jajisaparev.pbworks.com/w/file/fetch/144420660/antes_que_anochezca_pelicula_en_espaol.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113b0.bin
48350f6309de97fccca22b0e397701252defd3d7edbe08bec0731b7a1f816f16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113B0 5360 bytes
font_01_sfnt_off000125fa.bin
7b8ecbb24a328efc65e38e19ac9bd213c5cfd915be2618bd272e6f6ab99d8a57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125FA 11480 bytes

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