Malicious PDF — malware analysis report

Static analysis result for SHA-256 3812a68b17fec941…

MALICIOUS

PDF

71.8 KB Created: 2021-09-13 13:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 09b7a5b1605cef1cb12c919074009d5b SHA-1: 2c7dec6302e0c59e515cbfa7d60eef4a8773b21c SHA-256: 3812a68b17fec94167595a83615fb7ddd3bae0178a98a628234aabb58a39aded
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a network of redirecting links, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=best+apk+for+anime PDF link annotation
    • https://petrovsky14.ru/docs/files/75930979366.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/munifuzoxukes.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/57793077699.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/domufowunubezunitadiri.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/1930096444.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/sagadironutut.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/66688261659.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/79617566373.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/54604000948.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/bajug.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/97513996371.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de7c6132f---paroto.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/vizipenigawunene.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/datazexagojuzevasa.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/74924778702.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/rulazinewibot.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/21262882878.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/37660586271.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613112bb7cc27---79318912727.pdfIn PDF document text
    • https://adikketiga.com/contents/files/50393650681.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/bokojuzajogoxovefasinujep.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/73ddef542f8de49e7b363b6dcbbdd9c7/xuvepoduvorakufavijuk.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD075 10616 bytes
SHA-256: 6f7f040f5221fdbc091e08badf47b4463c8e536803e849120b2d1d3063a3bcec
font_02_sfnt_off0000e8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 16452 bytes
SHA-256: 2522c6430dccde8e2a5b6bc38eb47a2e9dc58f914163a86563dc4382142ee199

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