Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6753a8bc44e0f61…

MALICIOUS

PDF

69.9 KB Created: 2021-09-16 15:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9a426fc880aa00aa28fdfbe5f72f16a SHA-1: 3203ad1516d4204a173fb028ae67e8d19b56b15a SHA-256: b6753a8bc44e0f6199ce14f03845ab92b27e5e33fd0667816d64243f3955bf0f
146 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm and a callback phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites or initiate unwanted actions, potentially exploiting PDF vulnerabilities. The presence of numerous links on disposable domains reinforces the phishing and scam nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://e-park.es/img/uploads/files/2153884590.pdf In PDF document text
    • http://dhleisure.com/ckupload/files/bivajigoredas.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/60501595552.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/japetidedopopolojusosusu.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/90938101010.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/birenenepedekevavibid.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/3046804111.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/21779027293.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/954fbadd4069de35d55e14f0c5608a4e/tutom.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/buxuwarulad.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/54797821454.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/daribudijulivogewa.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/27718185383.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c123179f0---29173234036.pdfIn PDF document text
    • http://a899.net/userfiles/file/tiwil.pdfIn PDF document text
    • http://hkwwta.org/userfiles/89837966832.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/27308703698.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/49021345640.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/xuremamazidiboluza.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/dejezigumop.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/11012710885.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/bisonawobopubevon.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/zogososexapebovazexiki.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/59224968501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=down+by+banks+of+the+hanky+panky+lyricsPDF 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_off0000b1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AF 15348 bytes
SHA-256: 7534b153e2688dff14b25233fca0ab7e6a4a3c7b79e3c4c163626f19c891a90b
font_01_sfnt_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 11012 bytes
SHA-256: b5e56338ccab92b8679c39c21537a6e397ef95c73ab167dfdcaab0aff2c87a23
font_02_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1