Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f002dc80f9ed283…

MALICIOUS

PDF

69.8 KB Created: 2021-10-02 23:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a41cbcff9189451cffcb12a412e3b8ac SHA-1: 732e7122c357eeddd5ba56e92866390e6f98261e SHA-256: 7f002dc80f9ed2839773cb4f1dda9c8b1783ba7a5134eb74bb3e4d841ee0bd30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs and a heuristic identifying it as a link farm on disposable hosting suggest a phishing or credential harvesting campaign. The PDF structure and embedded content, despite being heavily obfuscated, are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://medvor.ru/uplcv?utm_term=going+concern+concept+pdf PDF link annotation
    • https://marugame.hk/editor_upload/file/tenupuvufagotazobigap.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/86160489476.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/14437159604.pdfIn PDF document text
    • http://th-hl.com///upload/files/jaridaluwerono.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/47238986378.pdfIn PDF document text
    • http://getvisa.ru/images/File/70095361733.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161574bb3a2930---xitarawalixopaloji.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/83326883353.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/46845939821.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/veferisaginakibi.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/lelewafajozad.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/ponis.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xokeforanulifoxejovonex.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615606a595c57---tikadiriposodawuxure.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/27649997394.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/58003613112.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/jibubepetiwe.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/tokabumamuvinisuzilago.pdfIn PDF document text
    • http://vpsystem.com/files/fck/tojir.pdfIn PDF document text
    • https://interangkorcondominium.com/userfiles/file/batanexu.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_off0000ae01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE01 17368 bytes
SHA-256: 7febde45c37c422bddbb8fc4abd9c011e2cf62ee0186d45d5a0bcc79591f4105
font_01_sfnt_off0000da90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 10460 bytes
SHA-256: 4325eb7d690070a769668b450dbf566c6c7480fdbfd5b0126494918ce91d4315
font_02_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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