Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86d88f10103b56d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 21:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc1662e8eded7c18fb25ce7fb58b3f84 SHA-1: e1dae1bb6a6000d97a12ab0efcdcd4b20ceb11ea SHA-256: a86d88f10103b56d94a010dfd2f959106fa38edaec30818ecdf8ec928f34188f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics, including ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports a malicious intent to trick the user into downloading further content. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ccs-corporation.com/ckfinder/userfiles/files/12916851116.pdf In PDF document text
    • http://levant-tekstil.com/other_files/File/ropis.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/pobaxawazubezafokuvute.pdfIn PDF document text
    • https://ms02bet.net/contents/files/kewotexije.pdfIn PDF document text
    • https://seger.cz/userfiles/file/64153721675.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/77165830619.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/61208797265.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/peritelunawoxi.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/11281112161.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/javebalujixoretor.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/rodavobuvido.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pexeluxaxogojiturisaf.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c636700461---monikuzelipare.pdfIn PDF document text
    • https://ka-base.no/images_content/file/62320193363.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/45058413431.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/pepapijuzuzadeluvibejexul.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/19072922332.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/22760176104.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/xetopupuriranag.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/gidelesibifabin.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca22c2431---97981226924.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/xexamafijurukaku.pdfIn PDF document text
    • http://195exim.com/datas/files/37468177943.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/kizojidepepomudamavigapi.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/donituvilatakasenepoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=prahaar+full+movie+watch+online+123moviesPDF 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_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 11200 bytes
SHA-256: 324d8644d48c8662a1636bdcf50ab2fb896a16792ebe36dceeec18e895b66d85
font_01_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001100c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 17764 bytes
SHA-256: bb0734fcaeaacc6b2a4f612a410d2174060b0ff11a8972b9337509ccc069f2fc