Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3e1dcb85a3bd2c…

MALICIOUS

PDF

68.4 KB Created: 2021-09-29 08:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8127c619db56cc7c25bcce974a6b9e42 SHA-1: de690731bad8797d9968feb180f0526141843e3c SHA-256: ac3e1dcb85a3bd2ca47e67bae5561f63e84b07f123637dcac165b52f919a5fc0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it is a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous embedded URLs suggests an attempt to redirect the user to malicious sites. The primary attack pattern is a callback phishing scam, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tencanpowder.com/d/files/fimajalodanuwijadul.pdf In PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/12758282997.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/jumuvodukugasu.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/17299604494.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/92222168920.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/rifulelexijit.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/8709168223.pdfIn PDF document text
    • http://partnercable.hu/files/tadiwamiladekujepa.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/nusafupavuxusam.pdfIn PDF document text
    • https://xaydungkienthiet.com/upload/files/50746222001.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/posofowogatep.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/bedavarabufibixesuwiw.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/2649206405.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/69111127811.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/lovuvofemadixukowava.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/81758871480.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/parerovo.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/46887844568.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/42863000336.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/91532404493.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/jusenadaluzeledefuzol.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/jexanuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=things+iphone+has+that+android+doesn+tPDF 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_off0000aedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F4 10588 bytes
SHA-256: 43e3d05cc6fa01c84e50dee2c89efa792b17a1c100ae883ed801146e34b88f4d
font_02_sfnt_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 14548 bytes
SHA-256: 9c08c4f8c7168e306abe15eb599643a13e5786c398359c53d88694a009175260

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