Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f41728da26d684f…

MALICIOUS

PDF

77.4 KB Created: 2020-11-24 06:30:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 45ac15e8954e8fbc93c5e6e66cbf6403 SHA-1: d6bf7bc503a3b1758afdb366830feafd6704d4ad SHA-256: 8f41728da26d684f64b6e1ecb163b4b1d2a14e49dda9603bd0d248da602dace2
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one pointing to a URL that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest it's designed to redirect users to malicious content, potentially for phishing or malware distribution.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffine.ru/123?utm_term=hotels+near+van+singel+fine+arts+center PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501965/normal_5fb47b406d428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f87055dbc5a7.pdfIn PDF document text
    • https://bufazori.weebly.com/uploads/1/3/4/3/134377245/1553682.pdfIn PDF document text
    • https://geredape.weebly.com/uploads/1/3/4/3/134349068/2729367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_5fa99b59b7026.pdfIn PDF document text
    • https://xomarexisu.weebly.com/uploads/1/3/4/7/134701616/nokuwokeporopodeji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369915/normal_5f91cc77148eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_5f8d58b13ad99.pdfIn PDF document text
    • https://pitadamep.weebly.com/uploads/1/3/4/8/134886808/wawusawa.pdfIn PDF document text
    • https://kosigejobawazi.weebly.com/uploads/1/3/4/3/134315380/8972604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449599/normal_5fae001c269c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465688/normal_5fa699f8b02e4.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/zikeko/begobidumizonesolexusow.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/lafudegixelixabifig.pdfIn PDF document text
    • https://s3.amazonaws.com/gonuxiwela/68413843902.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/66668432704.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_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 5072 bytes
SHA-256: b8dc9a36576ed12adbf33053ca378ff1c10a30e85c3cf9d34d8a8fcffe53568c
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 11036 bytes
SHA-256: dc5e6fa1f72e3662701b5692306a6cfc6c110bb0f4a3da01fd20b7eebfab284c

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