Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d65ab85d7c7ab53…

MALICIOUS

PDF

98.7 KB Created: 2021-09-18 16:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e4c74993265b39db5229bb1f21bf9ded SHA-1: 325b97907cc631f336a698d8ca2beab33666d5c8 SHA-256: 6d65ab85d7c7ab53c27eff6c0dbe1e818389af340ded3d37c24a3ad8c23ce2f6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm and a callback phishing lure. While no scripts were directly extracted, the PDF structure and associated URLs suggest an attempt to redirect users to malicious content or solicit fraudulent phone calls. The presence of numerous external URIs, many pointing to PDF files on various domains, supports the link farm and potential phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://travelworld.ro/userfiles/file/revopegipuvono.pdf In PDF document text
    • http://quranday.org/userfiles/file/33652398005.pdfIn PDF document text
    • http://emaaravm.net/upload/files/zaboje.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/2107498796.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/wakis.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/miniminitusilukijojej.pdfIn PDF document text
    • http://timebymtm.com/upload/files/15398996777.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/46217011361.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/17798252736.pdfIn PDF document text
    • https://togeltop.net/contents/files/murafe.pdfIn PDF document text
    • http://canvangdientu.com/images/file/30674835711.pdfIn PDF document text
    • https://csodamalom.hu/files/files/jogiletoziweliduworabegij.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/katuvozexesozadivukefosus.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/mekenowisis.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/69378426450.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/78553319080.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/fodewiji.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/konisemuloletokokapa.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/2432033614.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/69251860903.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/misezafep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=aplikasi+televisi+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_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 10524 bytes
SHA-256: 8059e03854269c663b2c975fd1652a605240673973b5410c9936ffa357a9d0ea
font_01_sfnt_off000137cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE1 17280 bytes
SHA-256: 4d393095d882a2a2bcae27d77ef72b0c8490653c279f0e67f622a3dc53ca3955

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