Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e8759d19e7408b…

MALICIOUS

PDF

75.9 KB Created: 2021-02-10 17:01:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7a73d56e00cf4201b5f59358de0d9983 SHA-1: 55a2ccafc2d48772d6fd2df0b6c5a2b4f1d56f0d SHA-256: 78e8759d19e7408b792835cbbce77f8df5af6ae5be4745f24b8aa5732791e17e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=bob+howard+nissan+norman+oklahoma PDF link annotation
    • https://cdn.sqhk.co/tubadaluzafu/jjgicTw/bein_sports_connect_app_fire_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/mowogibewu/jhNcjcL/zofow.pdfIn PDF document text
    • http://tokio-2020.fun/kewojxuovd.pdfIn PDF document text
    • http://abanca-electronica.com/the_flow_on_audiopkj2i.pdfIn PDF document text
    • http://qrettalq.online/metabolism_of_lipids_biochemistrylqfv3.pdfIn PDF document text
    • https://cdn.sqhk.co/fusojafiza/iaHbja7/traffic_rider_apk_mod_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/mupalewefe/gehajec/bageluninup.pdfIn PDF document text
    • http://trikotoria.ru/dobakufikjcl5.pdfIn PDF document text
    • http://samo-katim.ru/10233011409mvpeu.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/Mhj8No5/59442240753.pdfIn PDF document text
    • http://newyearshop.site/cv_templates_docrc018.pdfIn PDF document text
    • http://cryogen.me/57985865517s3f1x.pdfIn PDF document text
    • https://cdn.sqhk.co/gikunixa/i8aYUgg/smashing_the_battle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sazixipame/cafeland_para_hilesi_apk_indir.pdfIn PDF document text
    • http://ruxofepugoloma.rf.gd/20186821083.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/gospel_choreography_songs.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 5412 bytes
SHA-256: a96d00ea2fafbc06d83bac861004018b7afe21d1ac4755c36233c2c149b56d56
font_01_sfnt_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 11348 bytes
SHA-256: 900e8ef286ccb6c06d9e1c8bdecc44e7799ee9cef475feec34a3ffac4c719b55

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