Malicious PDF — malware analysis report

Static analysis result for SHA-256 095a5b0ba2fc7a17…

MALICIOUS

PDF

69.9 KB Created: 2020-12-25 09:52:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1db005e3dbec8a0735cb54810092650c SHA-1: b737b37b55842cc53b42c5d411e49ffbf2cc91c0 SHA-256: 095a5b0ba2fc7a1770ca76491a965fca028e3748d74d89d46c3dfaaae098a4d7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, with the primary URL being traffking.ru, suggesting a link farm or phishing lure. ClamAV and ML classifiers strongly indicate maliciousness, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attack pattern involving directing users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffking.ru/aws?utm_term=formal+and+functional+grammar+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489440/normal_5fcdc69f63683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464720/normal_5fd1e5afea801.pdfIn PDF document text
    • https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/lumovekotigifo-sijategagumokid-ruxid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402262/normal_5f9fe4b67bf08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424010/normal_5f9e888805673.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/pisedij/carrie_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a148f0f6-3023-4102-9835-b8e2b2e63485/elsword_elesis_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/74464812940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6ea921c-b9b0-4e03-be0c-6bd27b99cda7/clases_para_adolescentes_de_escuela.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/675173071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8cb8c88-236b-4838-9fa7-00387965869e/9787948973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bea8087-054a-468b-879f-d804ce94443d/gifted_hands_full_movie_with_english.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/programmers_calculator_binary_apk.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_off0000d637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD637 5252 bytes
SHA-256: 6b3bfc5f617d5720f5b89e8d8469a935e7c01724b5f4ef9635bcfc7f7dbd79f7
font_01_sfnt_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 10124 bytes
SHA-256: c67dc6d21e3ce51bc0ed530123f18c5d5a08779bf573a301def5293e0b2adedc

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