Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6e4cb57251504d…

MALICIOUS

PDF

71.2 KB Created: 2020-12-25 02:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f303e7cd43c1f163aa4ac0b0f478ff63 SHA-1: ddedc4dbaf5e46168786ef4e7639cf22c6eb5a56 SHA-256: 5d6e4cb57251504deed2714c48865cd601547dc3f9c7fa609bc06f7a9b61febc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://trafffi.ru/strik?utm_term=planet+fitness+inc+stock+price PDF link annotation
    • https://tonibakak.weebly.com/uploads/1/3/5/3/135346506/bifire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_5faa35ea1e3fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491670/normal_5fafa281476cf.pdfIn PDF document text
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/725067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454299/normal_5faa44861f1ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470409/normal_5fc05622be56e.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/1b7f902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f8e57e429b00.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/dezagulak.pdfIn PDF document text
    • https://kexinebig.weebly.com/uploads/1/3/4/3/134338338/zizekadinu-birekepiz-pifurexuxi.pdfIn PDF document text
    • https://cdn.sqhk.co/fopavege/d9ijXha/vulufepiwura.pdfIn PDF document text
    • https://tapotupuj.weebly.com/uploads/1/3/4/8/134866757/4477568.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 5076 bytes
SHA-256: ba28855e280aa8bdbb97bf90e4f19658378e9a02c4f92e40bdf672b963d6246e
font_01_sfnt_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 11632 bytes
SHA-256: 25a4f6597ead281a764dfd7334be7cf9b8413f292eff2c920d11e4e3ce39f3dc

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