Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8b696396d287bc…

MALICIOUS

PDF

76.8 KB Created: 2021-02-21 08:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0ab9cc41d60291ac71a5159646c4c459 SHA-1: 1235a6f460325445bd9a66cfb3b5b96bea92884a SHA-256: db8b696396d287bc327181cdd74a56d54fed080b783cabfecfa1e14e8579073b
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on low-reputation hosting. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest the PDF is intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=matlab+ac+circuit+analysis PDF link annotation
    • http://swast-group.website/a_single_shard_questions_and_answersnwkl9.pdfIn PDF document text
    • http://myyshooop227.site/makawobuwezonijeriqdilg.pdfIn PDF document text
    • http://hangookoil.ru/anandam_malayalam_movie_video_songs_free9bza8.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/H6fhfrm/82000610191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476418/normal_5feaede48405f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470540/normal_6006078e6f3f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478951/normal_601c90f63d90d.pdfIn PDF document text
    • http://womumonafip.22web.org/how_to_install_kicker_hideaway_in_jeep_wrangler.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414164/normal_5fd3c12ee279b.pdfIn PDF document text
    • http://ratubave.22web.org/66177664633.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452851/normal_5fe54d6350520.pdfIn PDF document text
    • http://markettop.pro/79290319149zsy4p.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/9jgcvji/jump_on_it_lyrics.pdfIn PDF document text
    • http://idealica-ituficiale.website/hitachi_cg22easslp_manual3f5xf.pdfIn PDF document text
    • https://cdn.sqhk.co/dufukeraj/gjejfdA/restaurant_mania_mod_apk_revdl_offline.pdfIn PDF document text
    • http://how2clever.com/ar_rahman_hits_songs_masstamilan1uitn.pdfIn PDF document text
    • http://edaruzal.xyz/lanutijjf2.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/erzFAif/daily_deals_allendale_hours.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lesexugisitu.rf.gd/65301502158.pdfIn PDF document text
    • http://biguwaximi.epizy.com/2320698783.pdfIn PDF document text
    • http://fexewagesulel.epizy.com/burnout_3_pc.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_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 5040 bytes
SHA-256: d755ab75547596d5b9b317e1d9ade679fa02c67f01223c9c9c9afc4b17c3f598
font_01_sfnt_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 11484 bytes
SHA-256: fec0da761f8fc20c604ef48dc14df023135eba019f1886687766667eb2d8f421

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