Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7666d88fc8b496…

MALICIOUS

PDF

69.3 KB Created: 2021-01-26 12:53:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0884f5e4215bf7f411a1ec2f9716c06f SHA-1: 201c862a412e65f80b2d7750f7fab8eb4f2694cc SHA-256: cf7666d88fc8b496ab2a3df2a82c9fbdd6120aa02b8dca433fbe1db69e4b76b1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with one prominent URL being https://trafffe.ru/aws?utm_term=visiting+card+designs+psd+free, suggesting a lure related to design resources. The PDF structure and numerous external links indicate it functions as a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/aws?utm_term=visiting+card+designs+psd+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465025/normal_5fdc4348225c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485714/normal_5fef538ede762.pdfIn PDF document text
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/2232073.pdfIn PDF document text
    • http://lunowizu.iblogger.org/misizogifugifimibifawegef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421460/normal_600c3994171a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463266/normal_5fcb9edabe3d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatojuwetowoj.rf.gd/miraculous_ladybug_turtle_transformation.pdfIn PDF document text
    • http://dixadenidufudu.epizy.com/regakeduwopanufeduzariki.pdfIn PDF document text
    • http://likusikukir.epizy.com/dukhon_hiya_bhagi_gole_song.pdfIn PDF document text
    • http://semiwexojexudu.epizy.com/cdl_general_knowledge_test_answers.pdfIn PDF document text
    • http://nufewusuk.rf.gd/banish_sentence_formation.pdfIn PDF document text
    • http://gabigirinekib.rf.gd/99357641547.pdfIn PDF document text
    • http://pasazaxara.rf.gd/stormtrooper_helmet_paint_template.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_off0000d294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD294 5256 bytes
SHA-256: dcd03294bb3392278002be3cf278fabf4ea029d3038a52a9ef3130b04377b080
font_01_sfnt_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 10524 bytes
SHA-256: 44407f8c4e240ae3063affc2119ec2f0ad7a42c79a7f80fc8066c51dcbd1a0d4

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