Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca285b26cba7b766…

MALICIOUS

PDF

82.7 KB Created: 2021-06-02 20:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ec198c76665daaf52e2881ed6892f8d9 SHA-1: b092f7464b302fdc13d4ae06aa846501010085ab SHA-256: ca285b26cba7b7668f3f25ecdcfecc89be210b6d9fe7ac07776dd305214135c9
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://irlanc.ru/pbw?utm_term=training+certificate+format+in+word+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445557/normal_6049c5bac70a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370265/normal_5fe0a60c0a618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_602c12797fcd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392652/normal_604d163104c58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495838/normal_5fcfec89175df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474206/normal_602b8bf7b778a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404296/normal_5ff91a863363c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446016/normal_604d0e5255537.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462037/normal_6005079c34700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_60314c4a956c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490001/normal_60664da248498.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144461979/how_to_check_pregnancy_with_pregnancy_test.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144428631/marketing_segun_stanton_etzel_y_walker.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/w/file/fetch/144419196/modern_spanish_grammar_download.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/f/balancing_chemical_equations_answers_phet.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/f/vadajojowofezu.pdfIn PDF document text
    • http://bilabegape.pbworks.com/f/how_to_determine_thickness_of_aluminum_foil.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/f/21672888057.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144411711/checkpoint_firewall_advanced_troubleshooting_guide.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/vizobuv.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_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 5204 bytes
SHA-256: 1b96188f057d63c985c3790d96f172a1c8979b8bab40970b4e9cd4db96ab5466
font_01_sfnt_off0001197d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 10384 bytes
SHA-256: 74c61bea09a36727aca942a3bd587ca6db4775823b04e6d95783ad5e5a659eb7

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