Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e249799de924ceb…

MALICIOUS

PDF

84.0 KB Created: 2021-03-16 03:27:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98e3465d6068b350445315be53f1cda9 SHA-1: d0385acd1382d7ba9a9746fc0d42ec383c20edff SHA-256: 2e249799de924ceb3d55c871a45cd2dfe434f8110a630fc74c03dbe8cef80b0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which are SEO-related and point to other PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic indicates a mass external PDF link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/award?keyword=bestiario+pathfinder+pdf+download
    • http://vuvuga.xyz/fuganasd2qw.pdf
    • https://cdn.sqhk.co/gujowaxexag/ghhcbxO/luvilivanerotanonive.pdf
    • https://cdn.sqhk.co/fakobijo/RCgXbnK/tiktok_ban_countdown.pdf
    • https://cdn.sqhk.co/ronofumito/DLeW8hi/49419438045.pdf
    • http://chempion.coffee/fupuwodg1d69.pdf
    • https://cdn.sqhk.co/tobijoge/7s1hh22/loxijitalesidorafemi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mamukawaxatali/chemistry_periodic_table_free.pdf
    • https://s3.amazonaws.com/zuxime/secure_folder_file.pdf
    • https://s3.amazonaws.com/xixonu/4572867898.pdf
    • https://s3.amazonaws.com/bokelur/84869717283.pdf
    • https://s3.amazonaws.com/wutogugej/facebook_likes_free.pdf
    • https://s3.amazonaws.com/sevoga/rename_worksheet_in_excel_not_working.pdf
    • https://s3.amazonaws.com/jofunozuzof/barnsley_sixth_form_college_holidays.pdf
    • https://s3.amazonaws.com/vabemavuputenif/fidelity_advisor_401k_platform.pdf
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_3374fbf5896642b4b2b6f17f078da0af.pdf?index=true
    • https://s3.amazonaws.com/wolawatin/machine_film_background_music.pdf
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_eb50765d501a450f90b4be9c9427101f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010271.bin
6323c5d5385d78d25a5bb8545610993c47a6eb59f53c92f10ed715ec70de4d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 5268 bytes
font_01_sfnt_off0001146d.bin
e360cde94ccceb8d012af8e924391704db4a9b88977f9e0a61389b3fe5f394d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1146D 14700 bytes

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