Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00878404fcfe7d4…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 22:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6329ad480e091df8f51764688dc5ac11 SHA-1: d31bba1a7f807cd92026e4fd028ad073c22abb67 SHA-256: c00878404fcfe7d49187c716bf4d82a67986e39cfc932543dce376075c7a12eb
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to a download for 'gta vice city android apk', suggesting a lure for users seeking game downloads. The PDF's structure and the presence of many external links further support its role as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nomylo.ru/uplcv?utm_term=download+gta+vice+city+android+apk PDF link annotation
    • https://ktmcollege.org/public_html/userfiles/file/tezamutenefi.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/71160109242.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/10290887581.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/41191423001.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/galisifujofitijej.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/12368849258.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/xunoxizowaposaduwanolamu.pdfIn PDF document text
    • http://fygl.net/uploads/file/0603100045.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161381f26918d3---72163353739.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/vuzigetapuvojunukij.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/83435496754.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/peloguxurul.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/nomibonajomusijar.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/61045093152.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/35375143673.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/87607568688.pdfIn PDF document text
    • http://esistore.de/userfiles/file/rageg.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210907_AC72ED09BB0F181A.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/8847335400.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135077403f66---firiniwikuredosowexunujot.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/pawasojorogovitotojizago.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://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_off0000b1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AF 17660 bytes
SHA-256: d3470582c49d9ee6a46682313931a0633f021644eca985040f3a5dbc5576909f
font_01_sfnt_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 10880 bytes
SHA-256: 03fc78c7821c2ed2319d454747e4eaf285c8cb7d0276f64ec4e28e84abd31d80

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