Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd5a2fb9765716a…

MALICIOUS

PDF

79.4 KB Created: 2021-01-13 04:23:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e9ef218cdb16e1b4b4ab799daec4b800 SHA-1: da486311408a197b4ea69a0c1eab640b8a0e7b86 SHA-256: 8cd5a2fb9765716add880f52138c46737928b0c631d7e21f6f69cc520610858c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=britax+advocate+manual+canada PDF link annotation
    • https://sasikeruxet.weebly.com/uploads/1/3/4/8/134851076/4740935.pdfIn PDF document text
    • https://fidifeso.weebly.com/uploads/1/3/1/4/131408027/gusaxogoxibumakabi.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/rerimopotesim_fasafobekimula_megesiwasego_zawenadafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427785/normal_5fb4f9034bec1.pdfIn PDF document text
    • https://vebajixumese.weebly.com/uploads/1/3/4/4/134483039/6580593.pdfIn PDF document text
    • https://fineruliji.weebly.com/uploads/1/3/4/3/134313455/4724175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421778/normal_5fc265cddbc19.pdfIn PDF document text
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/gilaweluran.pdfIn PDF document text
    • https://volokosebu.weebly.com/uploads/1/3/4/8/134871595/4396200.pdfIn PDF document text
    • https://xipeluzewuwese.weebly.com/uploads/1/3/1/4/131406434/713241.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/niwotipugonuvoz/direct_speech_worksheets_grade_8.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/fozud.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/jigewuvepelivobiwapide.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 5084 bytes
SHA-256: 5b68cc60dd31b59a9c90f3b1f7f0aa87d509c224bd01ef94d0bfa7f43d59081e
font_01_sfnt_off00010c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C92 10496 bytes
SHA-256: e719b9e355864590ae827f055c6b76a2660d2144bfa7256ba043c9d95d441c09

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