Malicious PDF — malware analysis report

Static analysis result for SHA-256 734b8ff33c95895d…

MALICIOUS

PDF

71.8 KB Created: 2021-01-23 09:50:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e95d785dc2939a503d12737456baf614 SHA-1: 96d31bcff8df9a8b66fdb0929b9f1ca3f248eda9 SHA-256: 734b8ff33c95895d7f21df1f3e5a1bed584ab6dec5501fabcfb46645c5a48c5e
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs, such as 'https://trafffe.ru/aws?utm_term=bible+books+list+pdf', are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?utm_term=bible+books+list+pdf PDF link annotation
    • https://megefutuw.weebly.com/uploads/1/3/0/9/130969536/minazepinuval_ruvomadobug.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/3b853.pdfIn PDF document text
    • https://nakofasojerurog.weebly.com/uploads/1/3/4/5/134592478/e0eae2e.pdfIn PDF document text
    • https://cdn.sqhk.co/kitatoze/hjigiL1/espn_fantasy_hockey_keeper_league.pdfIn PDF document text
    • https://site-1177285.mozfiles.com/files/1177285/85362494299.pdfIn PDF document text
    • https://site-1174558.mozfiles.com/files/1174558/free_software_abbyy_finereader_11.pdfIn PDF document text
    • https://sinuxogutit.weebly.com/uploads/1/3/4/5/134505158/7111816.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/Uifij5p/vurowiravurupofezijol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487916/normal_5fcc8cd950cb8.pdfIn PDF document text
    • https://cdn.sqhk.co/tovisegag/RhfvajG/36017035820.pdfIn PDF document text
    • https://site-1175420.mozfiles.com/files/1175420/credit_report_transunion_equifax_experian.pdfIn PDF document text
    • https://cdn.sqhk.co/dezosanag/16idibH/dufuzunejufofawubowimubu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kizuwopo.epizy.com/ubuntu_image_file_for_vmware_free.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_off0000dc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 4980 bytes
SHA-256: 0b51f3abbc9a64aa00a6edc87bdadd642b2957774ef6827dc040c0f464299926
font_01_sfnt_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 11000 bytes
SHA-256: f9f6585d8c0c16a08e9d378458ea2b9ce485720ee1e16cad9e36ed7bdd97e3ad

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