Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04c66fd7338fa99…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 16:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c50ff4e00b71e7545cf8c19197cdb59 SHA-1: 3da77914a2496a56cbb1f4eb77a3660b492e2c98 SHA-256: c04c66fd7338fa9907348998ae44db8d9773b8bb185867fa984a35d710ad92a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct PDF files hosted on various domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a non-clustered link farm on disposable hosting, suggesting a coordinated effort for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://adance0112.com/upfile/editor/file/98897995943.pdf In PDF document text
    • http://sbairs.com/datas/files/28195877374.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/daruneloporokusilotafawu.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/32042797947.pdfIn PDF document text
    • https://davnosti.ru/upload/39057544729.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/gezosukimi.pdfIn PDF document text
    • http://stevis.cz/files/file/8517571882.pdfIn PDF document text
    • http://anindecor.pl/files/file/15557788778.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/toxasejegixexixofiretof.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/71217967420.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/pukuzogefuvenujul.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/39491599879.pdfIn PDF document text
    • https://aneri12.eu/res/file/xasubagokipoputimukugujep.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/jifebopowub.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/14318813964.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/97738274488.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/zofejunaxabutufibef.pdfIn PDF document text
    • https://msvadba.ru/files/file/vakomus.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/metorafasolurefoxu.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/vajirepilugojanaloj.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210911044720.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132134363f68---18038114631.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/jaletadomuribeg.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/pamoloxabufolixiwaketuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=restaurant+games+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_off0000e2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A5 10688 bytes
SHA-256: ec9bc48abc2d4af4684300a8690a7ac282ca7b7c2102b89d13305836d7583db9
font_01_sfnt_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 17156 bytes
SHA-256: 1562378aa59b644094d9c981a5ad16710469935645b71835d43e84379a292292
font_02_sfnt_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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