Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7347375f62505e9…

MALICIOUS

PDF

69.3 KB Created: 2021-01-07 03:30:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 37b3fe8f3838d3f2ef21c56a1e4c991d SHA-1: 9aa44e0a5c2078a58dcaf816d7396a50349cc345 SHA-256: f7347375f62505e958d31bd94c9a65527ec7c34d9d90a52a98aea76cf6bb574e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The embedded URLs and the document's structure suggest it's designed to redirect users to potentially harmful websites.

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://trafficel.ru/123?utm_term=when+was+revelation+song+written PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453118/normal_5fb6a41355100.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485308/normal_5fee4605998b2.pdfIn PDF document text
    • https://cdn.sqhk.co/wevujawej/LCL4ijs/facebook_live_local_news_orlando.pdfIn PDF document text
    • https://tugigoboz.weebly.com/uploads/1/3/4/4/134499705/c7760fdd2.pdfIn PDF document text
    • https://puvapimasekasu.weebly.com/uploads/1/3/4/3/134398754/1770854.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458826/normal_5fe33d9b77c85.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/bc6c8109.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/4874842.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/fuluperomuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/luvutagawata/gchcifu/sasudubopipuzinot.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/gubuz_jupevuluxel_wababulozepulov_vivulov.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/sugapojere.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_off0000d2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B7 5112 bytes
SHA-256: 15d6ee6ff9fd52b54b716db55bb6c17b531f4b03b9642f842aad34923fb675ed
font_01_sfnt_off0000e439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE439 10660 bytes
SHA-256: 7d25fbd35d32db3bd20714d22f6b3cbe5c18ecfefbbf004cca1cc965af2391ea

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