Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8e8ed6b4aa9b06…

MALICIOUS

PDF

64.9 KB Created: 2020-11-13 23:59:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e2ed14e260ae598589b2a38cfca8f635 SHA-1: 12290539dc9bee49e30e1963f7800095f8d4b300 SHA-256: cf8e8ed6b4aa9b061e4d3ff0697289567d1b9d0870a87d30d9eea5fd0c43eafc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://traffine.ru/aws?utm_term=driving+test+questions+answers+canada PDF link annotation
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/7885719.pdfIn PDF document text
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/dagike.pdfIn PDF document text
    • https://zugufavowi.weebly.com/uploads/1/3/0/8/130874222/a0055de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427526/normal_5fa35dfbc0248.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/4510944.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/jomukirenetalezatobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409394/normal_5fae21b60dbc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5f8c02c106323.pdfIn PDF document text
    • https://gerexogevi.weebly.com/uploads/1/3/4/4/134463414/b8c563215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_5f9be52523970.pdfIn PDF document text
    • https://vozexipazaxa.weebly.com/uploads/1/3/4/4/134444785/zebosor_zenemibosikimi_tofobu_sodolotowugoduf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423443/normal_5fae00d7e42f8.pdfIn PDF document text
    • https://gorigopaf.weebly.com/uploads/1/3/4/3/134341526/tobovor.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/fea3b4ed-53e0-40c4-ba8c-125330279e89/mario_piattini_auditoria_informatica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a1cfd79-4321-4885-8ede-ef4bc1f7c3fc/cs6_design_and_web_premium.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_off0000c0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D3 5352 bytes
SHA-256: e68ba4f54defa31b731fc054eb5fedb1620527408c83708a6e3a9d9485cc4b6e
font_01_sfnt_off0000d32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 10304 bytes
SHA-256: 41bb6a6582a9b1d2b0a00eeb79357f953a0a76cfcefd4dfcd5f1b94db9f0dbed

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