Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c31fcea0ce44ef…

MALICIOUS

PDF

80.5 KB Created: 2021-01-01 13:56:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4601e40f8110568646c48aca365d41d2 SHA-1: deca4d3c620041f5cc493038c23550ae90eed701 SHA-256: 42c31fcea0ce44ef477648bf7abb5d1f90517d8dc94904e75a1d8c3afc55fb69
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 0.9997

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 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/strik?utm_term=super+brain+throw+the+ball+in+the+basket PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5fc0533bea0a6.pdfIn PDF document text
    • https://jaxifojuw.weebly.com/uploads/1/3/5/3/135351184/kevuwelukiwesep-lovizelese.pdfIn PDF document text
    • https://penopetidurip.weebly.com/uploads/1/3/2/8/132815040/8562427.pdfIn PDF document text
    • https://cdn.sqhk.co/jibenapola/lmIhbgg/2019_swipe_brick_breaker_legends.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418170/normal_5fdde2c4eaf53.pdfIn PDF document text
    • https://zapeledi.weebly.com/uploads/1/3/5/3/135314532/492440.pdfIn PDF document text
    • https://barijimuje.weebly.com/uploads/1/3/1/4/131406344/1f789d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/faf51fd9-ccf6-444f-a35f-91ad0603ffe7/animals_that_reproduce_asexually_by_fragmentation.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/sewufexawofakuliga.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/free_complaint_form_template_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce55a7f1-de43-4abc-b17a-5765c91bec90/sanirelasunutodutotab.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/digital_assets_management_system.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 5188 bytes
SHA-256: 3f5ef4aeec01ab35b93baa14ea9918fd3ce0cf7f5cde137603bf7b016d743674
font_01_sfnt_off00010188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 10812 bytes
SHA-256: 9628db9fec46db9e95e3c838e3f1ef1fdc926afa8fdd4ce02551a0147556ddf8
font_02_sfnt_off0001266a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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