Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc3f996a669604a…

MALICIOUS

PDF

72.8 KB Created: 2020-11-17 08:02:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c58e871bf5e477c8c5b405a113a91bcf SHA-1: 2688c352027921213e87d817dce19763722a6ef4 SHA-256: 9bc3f996a669604af83f1e9bb2d9acd8f98ab5d7c9ceecbf9994d716d46d5d56
156 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, a common tactic for link farms or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious websites, such as the one found at 'traffine.ru'.

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://traffine.ru/strik?utm_term=ejercicios+de+datos+agrupados+resuel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391599/normal_5f9ce107011b2.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/580bbf05e8d8d6.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/7394523.pdfIn PDF document text
    • https://zedaluridafam.weebly.com/uploads/1/3/4/4/134464222/4066494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5f8924de13ff7.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/113208.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/2f1de4e2-69d2-43d7-9fe8-6368222e84ac/pexuxifux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53594020-b4cf-4e5b-a5b4-cc4a0c1b4974/day_trading_with_price_action_galen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1764625-aed2-48e0-92f9-aca203e685f5/bloodborne_official_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/97766742966.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/android_studio_change_version_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e9fbcd-8a3c-4303-a0ce-6033563affc2/bomexiwowibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/709450c4-1361-49de-8094-97c91a846f49/the_definitive_book_of_pick_up_lines.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_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 5272 bytes
SHA-256: 0db9a3a297297dc96414d780756b3347afd1b5cc4707c12f3c17afd6b53b51f6
font_01_sfnt_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 11824 bytes
SHA-256: 5763c0d04c2c018af776c11f06e7b7664c299992946356b8b6c263f7659ea5ff

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