Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca7b3843ac127f8…

MALICIOUS

PDF

78.1 KB Created: 2021-02-27 14:48:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 548dea636bb8610abaafce624ee529c9 SHA-1: 208b43073a2c78d59f442f9531cc0b322285771f SHA-256: dca7b3843ac127f8873c11c2b27cdae1eb58bd2851b8b4e3cbdad1572cc53d1d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to safety handbooks, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/123?utm_term=handbook+of+osha+construction+safety+and+health+second+edition PDF link annotation
    • http://kakolamilasaru.medianewsonline.com/pirovapuxixozimir.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/32809843651.pdfIn PDF document text
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/jiwan.pdfIn PDF document text
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/wexixubigul_fagenopolopokog_gagira_tetetobabiza.pdfIn PDF document text
    • https://katatowuli.weebly.com/uploads/1/3/4/8/134879603/6852183.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/finanzas_personales_para_dummies_descargar.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/f0gg5uS/39052475421.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/kujesulad/jigewixetu.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/tumowibofenilut.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/2078894813.pdfIn PDF document text
    • http://nupadamemal.epizy.com/wewajex.pdfIn PDF document text
    • http://jolivawojo.rf.gd/dka_guidelines_ispad.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/49811375183.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_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 5376 bytes
SHA-256: 66b6c10bf734dd2b135567f538ec82fdbc627497a9928bbe12d51dd0e5db3ec2
font_01_sfnt_off000105cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CC 10944 bytes
SHA-256: 1af55750b18993538f8a8b33958fd4b2ca6932955939d43207397822a8db4c7a

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