Malicious PDF — malware analysis report

Static analysis result for SHA-256 772d3f8191ce7256…

MALICIOUS

PDF

69.9 KB Created: 2020-11-26 03:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4a14e4b756d8c449562739354c9a99a0 SHA-1: ee7b4499aee4e18039b9e7ca3893a3b9a5a84ebd SHA-256: 772d3f8191ce72564bfa56c591d9758c5c069f9191cf1aa5c0c32d35eb46f5c7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, including one to 'trafffi.ru', suggesting an attempt to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf and references 'Nasa war document 2013', likely a lure to attract clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=nasa+war+document+2013 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413465/normal_5fa890aeef9b4.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/94b984da07c.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/d1fef4448b24de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481052/normal_5fa88d97f4194.pdfIn PDF document text
    • https://nawajutexi.weebly.com/uploads/1/3/4/1/134108687/pijaluligipi-jojorumane-gulopigijexudoj-melodu.pdfIn PDF document text
    • https://zuxobopabure.weebly.com/uploads/1/3/4/3/134344154/3513561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503791/normal_5fb4e7af7f4db.pdfIn PDF document text
    • https://virubavu.weebly.com/uploads/1/3/4/7/134755547/kubabopin_rovafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_5faf146eb086d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f8f00262ac6d.pdfIn PDF document text
    • https://gusizamavuva.weebly.com/uploads/1/3/4/6/134629738/5785421.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f8ba79-3b0c-4749-a7a5-0072dce9f918/dont_throw_away_your_shot_hamilton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6a3092-9fd7-492b-9ec0-4fcade4f6a66/against_school_gatto_summary.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_off0000d538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD538 5604 bytes
SHA-256: 878f3092eacce8545cfb5b5ab4a4827b34a9f6ea15943035fae21dffd791b220
font_01_sfnt_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 10180 bytes
SHA-256: c2151b0c6eb7950b40e63f17284091c77eab4bc6e03e9f3bffcd3ffaf25da8a5

Open this report in the interactive analyzer, or submit your own file for analysis.