Malicious PDF — malware analysis report

Static analysis result for SHA-256 c702f20c1a3af108…

MALICIOUS

PDF

68.9 KB Created: 2021-09-17 15:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7826afddcd2e631544d39365d1ccc133 SHA-1: f666b9e38d4b71be3138e68b306ed9784d8f2c8f SHA-256: c702f20c1a3af1081bc8b75c9ef66b0a47656b92b92bccdd7acfdf0e3f6169f5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The document is image-heavy with minimal text, suggesting it's designed to hide a clickable link, a common tactic for phishing or scam operations. The presence of numerous external URIs, many pointing to disposable hosting, further supports this assessment. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pixomot.ru/uplcv?utm_term=view+instagram+private+account+post PDF link annotation
    • https://ruta.hu/ckfinder/userfiles/files/bujuxuxubazixojen.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/55458726579.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/92470510727.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/32690581383.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/28582400738.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/ribaburiratikirokal.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/lawiwematapetukam.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/94975749303.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/70820810392.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/58583644569.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/vjoue8kmo0jr62e241qqoo9rne/33788049202.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/nozaja.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109151754302706.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/tepinaruloxijonomagiwarik.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/seroxogefebasuxaxed.pdfIn PDF document text
    • https://fishuntpesca.it/file/jovewomu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375cb27f823---pemupunerinazag.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/zisiratamewipuko.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/xipiruz.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/44954955886.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/4390597658.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/94534095355.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/17637625509.pdfIn PDF document text
    • 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_off0000b1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BB 14068 bytes
SHA-256: b3416c7d2597b22941c10c1f1454c06ddec5d07b8304050d4ebbf53284e5c335
font_02_sfnt_off0000ec83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 10892 bytes
SHA-256: d06d214363cdcbcfbc64d38963cdb325372376f1e884af0c7eab1af31ca1ac4f