Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31fefe69b6dc774…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 05:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 797940321be2a9db3f8a8d9c8d2b2c9c SHA-1: 8402a6f47ee0e3ca0ea966c321a44391b2366feb SHA-256: c31fefe69b6dc774cc5066105de0622b1131df6066042fa23e9043b79a1f951e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or tech-support scam. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to prompt users to make a phone call regarding a financial or security issue. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites or initiate further compromise, aligning with common phishing tactics.

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.
  • 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://jornalespacoaberto.com/app/webroot/datafiles/editor/files/wijudegux.pdf In PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/goditadetarenojubarok.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/pituxofadejixo.pdfIn PDF document text
    • https://socardan.com/userfiles/files/mixaruvuwuzuponifopufef.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/nagovimitakodokimasa.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2sabovi8tbqdas5v6vsrsjb0k7/wovagupilijuzedoxeso.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134684e22360---15681391813.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/jelupeg.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210912_87D5C2CC39130126.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/lefiwososidod.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/zaxonimexinibigiwog.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/7792960906.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/94022880387.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/xowizenelixonimibebexul.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/zuxevatadegojob.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/zopubefilaliwafeja.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb83322b2b---lifodutigalebubasiro.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/12236571413.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/pazurinukapujenudoxonef.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/6100154306.pdfIn PDF document text
    • http://knauto.com/upload/file///rotuvegosukanipadugef.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/lijurapubanulajiwazudom.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/pusepisigumezuwamamixigub.pdfIn PDF document text
    • http://synphabase.ch/upload/file/wolegizik.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/xosul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=miui+based+custom+romPDF 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_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 10612 bytes
SHA-256: 4fb3f21e1aa40e9a7b4727d3e90b61c7f163f30ac4d44e3005bb01824f659567
font_01_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 18588 bytes
SHA-256: 867ee66fec5b62e7883954c70f91137461294b9bb5e66fe254f12443191eb9a7
font_02_sfnt_off000128b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1