Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad70631b68d0b44…

MALICIOUS

PDF

71.1 KB Created: 2021-04-20 14:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25c710f44050f68dcdd0d8dc3546771e SHA-1: dfa51a0c12fd7fbb81bf3c8800a63cf954378785 SHA-256: 0ad70631b68d0b441a3a80430c8ef1ebe63450fe3af2da49b78cffb2e1358725
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically mentioning 'cash app to buy and send bitcoin', suggesting a phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, as does the ClamAV detection as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's designed to redirect users to malicious websites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=how+to+use+cash+app+to+buy+and+send+bitcoin
    • https://cdn.sqhk.co/kuwusemob/CeW8Yie/rimidozilitimonofitiga.pdf
    • http://juzajikadig.22web.org/40719239860.pdf
    • http://atlas-copco.su/10479298913af6g7.pdf
    • http://hiziryigit.online/how_to_fix_the_bobbin_tension_on_a_singer_sewing_machinetdvsy.pdf
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/3866b7a32.pdf
    • http://tamekawarol.66ghz.com/kejalok.pdf
    • https://cdn.sqhk.co/busanurutar/gcthfjf/dino_land_match_3_adventure.pdf
    • http://wumijodurixemi.22web.org/information_retrieval_conferences.pdf
    • https://cdn.sqhk.co/bisuligiga/jjihVjX/depepalebewepoxarimevepis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jemibare.epizy.com/nafaritamowox.pdf
    • https://uploads.strikinglycdn.com/files/189f643a-cc50-4b2e-83cc-4d990c8c4e9e/review_handheld_label_printer.pdf
    • https://uploads.strikinglycdn.com/files/0b1328f2-4737-4998-b554-f8cb4a140731/62819313897.pdf
    • https://uploads.strikinglycdn.com/files/097ef2a8-b6d3-4da0-8e52-3a478d29a509/97116521418.pdf
    • 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_off0000d870.bin
0f220af2763d0d136b2df852074091952c3f384066139652d29763c3d11dc358
pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 5328 bytes
font_01_sfnt_off0000eaa3.bin
56692cd2be974869d1cf054bb4192e5255348b814847b7c0a401ae5310e23b14
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 10744 bytes