Malicious PDF — malware analysis report

Static analysis result for SHA-256 6690df0f7ec5dd74…

MALICIOUS

PDF

72.0 KB Created: 2020-12-16 22:27:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c425a6d7fccc4c451357501f003a192d SHA-1: 9b6d3b8c63ec75880e0925f4caffea82f27598be SHA-256: 6690df0f7ec5dd74bfe2fe5a80dcdb114e5766a87cef7d16991aa39c373bdb48
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, with one pointing to 'trafffe.ru'. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. While no scripts were explicitly extracted, the presence of external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=label+parts+of+sewing+machine+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447888/normal_5fa86bf42b08f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407576/normal_5fcd8064a8bde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415292/normal_5fb36d8730022.pdfIn PDF document text
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/setixonusem.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/tometubufimopim/tamil_movies_hd_2018_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5381a405d5340f345f063/t/5fccaa04e43f2b00a8a41817/1607248389047/68930095556.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/tojeturupi.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/makita_plunge_saw_2_guide_rails.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28fecc30a162e0c5d0be7/t/5fd1c2360f163860c7aef4fb/1607582262787/birthday_cake_ideas_for_60th_female.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/what_is_the_business_and_industry_endorsement.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/bifenidogotef.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dc232cf09257bd6bd446/t/5fd14ef3a3ae4c72e4bb0063/1607552755283/outdoor_garden_decorative_balls.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_off0000de25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE25 5664 bytes
SHA-256: 8808623d46d689c5a3186da13c7ba10b105aff23c41c3f51086cff642323c5ab
font_01_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 9864 bytes
SHA-256: e163b4b0c84a912cf52aedd7a1c62dbf82e9d40ae133dd45494ebf9385613fad

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