Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4bd7abd29e51f8…

MALICIOUS

PDF

72.3 KB Created: 2021-03-11 12:32:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0b6f13d0f617c8f25b39fd94eda8987b SHA-1: b6b744a5ac7fda42e1c5635d4ef8986e27c46377 SHA-256: 3c4bd7abd29e51f8ecc4c3fee6ce9ee694ed01f987668008bf13c51c8517856c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=grade+8.+8+bolt+strength+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485436/normal_60258e18dbf4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_603d057c5efde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_5fd2d8a99ed87.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/ijjicfy/pilosepowinilurelujoner.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458132/normal_600ef59fcf19a.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/bV7EgeM/airport_scanner_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/xiteduva/ggiasig/8333221201.pdfIn PDF document text
    • https://gatamerat.weebly.com/uploads/1/3/4/0/134000446/30527e56f089e.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/zJgwbjb/3874418213.pdfIn PDF document text
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/ponijozavolawine.pdfIn PDF document text
    • https://wavopotajulaja.weebly.com/uploads/1/3/4/6/134631105/pisodimeku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5ff25ecc12eb1.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/jzFnjhx/96488258731.pdfIn PDF document text
    • https://lozexisivebuzon.weebly.com/uploads/1/3/4/7/134702594/lofirosotutana_vatexijagisim_taxavusemasezid_mezuworik.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/9xhjMih/wobifoxapepo.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/zupenafud/31184548831.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_e3b562a886b44cdba16d3ecb15225616.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_29ba0043f0e542f99944aa8f1bb579a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/31684648950.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/birthday_cake_with_name_song.pdfIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_ae939284887a476fb7e632cf29cac376.pdf?index=trueIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_08302c6694ec4befb7a64965be5ffe5d.pdf?index=trueIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_04205e4f4a9a4ef6838ff31e342a84e2.pdf?index=trueIn 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_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 5700 bytes
SHA-256: a35a327b6219fbc46b843176cb921867a8dd2a35550b5ce7171114b13dbd871f
font_01_sfnt_off0000f037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 10460 bytes
SHA-256: 5bec39de1aa45b539ce4009a5854bf90b8093f65dd342e35cca98d09ff6d79b2

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