Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ef8a2c66af64a3…

MALICIOUS

PDF

79.0 KB Created: 2021-09-24 02:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e044df15db1b4b9e3270c22855f79899 SHA-1: cbab5c11d21bd906c7bbf4686117ddc4a63137b6 SHA-256: 95ef8a2c66af64a39f20639755880c5cb3990a0ae4891eaf6f9951ff4e7fa116
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketex.com/trcgp/ckfinder/userfiles/files/15295809693.pdf In PDF document text
    • http://hanyuchina.com/upload/files/69102141416.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/72775952351.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-9/20210909195403945686.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/setufolawo.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/83298227006.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/61461db9315d7.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/soxif.pdfIn PDF document text
    • https://vitanov.rs/files/22763314593.pdfIn PDF document text
    • https://davaocarrental.com/images/file/92614601568.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/73446901699.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/tetasap.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/luvodifax.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/c51398510dcf9449b9e10bdd3802da69/mugirefudevepaxan.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/42023599596.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/dakipojilixezezebud.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/21724393807.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090420074373499.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/xekek.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/bofupezejufizugorodokitu.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/tuvadobebizagumejigojow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=hd+streamz+hack+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 17088 bytes
SHA-256: 8506f1d1c752a2c31f3eb7d60b0afd00e882e71f5745c92a1ab5f9d407e528eb
font_01_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 10560 bytes
SHA-256: 038fb51d044dd540d5965fa4f804332c96f62453f64b810077c16e53b5089c75

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