Malicious PDF — malware analysis report

Static analysis result for SHA-256 18964259012755c6…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 06:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba72078aaad263fdda5429c59cf4620b SHA-1: e41e9d65e1bfa1a71fc842235afcd95c6bcca4b3 SHA-256: 18964259012755c6f405ea017d6c48cd177e8b6c1fb13dc64d2422a82a54dbf8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous distinct hosts and embedded URLs pointing to PDF files, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://baracenter.be/userfiles/file/3721311892.pdf In PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/43527137188.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/ponokexokamotebid.pdfIn PDF document text
    • https://blogsma.com/files/4967169490.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/83481372505.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/70918238092.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3a2d8eea8---miwugutuler.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/26678399697.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1b3066786de930be758e3dc7afa7088e/tezoxovuvub.pdfIn PDF document text
    • https://alariel.be/userfiles/file/gapixusobikufe.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/85917942293.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/gekesoxavubaniwezuxuxama.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/mapige.pdfIn PDF document text
    • https://steammining.com/userfiles/file/8957630209.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/noramovaz.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/89449180567.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/guxowarotakaxelilanav.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/91005151978.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210916152834_8k5jhz.pdfIn PDF document text
    • https://phunhai.net/upload/files/polemawifasezi.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/45097411613.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/wukololeridaramokog.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/60711629384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=game+arcade+multiplayer+androidPDF 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_off0000d24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24A 10760 bytes
SHA-256: 9cfe578ae01cc14d091018615c995cb13a1e485552e3717dcf11117928fc0152
font_01_sfnt_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 17468 bytes
SHA-256: bd41ee579f36b4fb09a07803fd0fa0c900405e467268ad12d06e76e5b3f8acfc

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