Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a470e38e1afbcf3…

MALICIOUS

PDF

72.3 KB Created: 2021-04-06 11:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b0b87efd5191d8f9ba137edb67580bc4 SHA-1: 851f16ce15c69da23eb9bc45fa302215bd71cab0 SHA-256: 9a470e38e1afbcf39ec7fca3e1aaf05d7cb394064542e264c3bf1990a6bd0ec5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the document as a link farm on disposable hosting, and one of the external URIs points to a URL that mimics a search query, likely to deceive users into clicking. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=can+a+coleman+catalytic+heater+be+used+indoors PDF link annotation
    • http://deemonatrafik.xyz/5816388515076fl8.pdfIn PDF document text
    • http://kompledom.com/bittorrent_not_ing_wifidngpy.pdfIn PDF document text
    • https://cdn.sqhk.co/madosodu/jj4iche/lord_bal_krishna_wallpaper_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jojipimuve/M96ihmV/41724662668.pdfIn PDF document text
    • http://3bki.ru/power_pressure_cooker_xl_baby_back_ribs_recipebbr01.pdfIn PDF document text
    • https://cdn.sqhk.co/dosojegomugu/gOiemia/super_spaceman_world_of_warcraft.pdfIn PDF document text
    • http://sijibufaw.iblogger.org/mathematical_critical_thinking_and_logical_reasoning_questions_and_answers.pdfIn PDF document text
    • http://rezotu.xyz/metroid_2_remake_downloadist2a.pdfIn PDF document text
    • http://shothard.site/netgear_gs108e_manualm295x.pdfIn PDF document text
    • http://uscovidcharts.com/rurinoiium2.pdfIn PDF document text
    • https://cdn.sqhk.co/baxikomo/UhjZBaX/kuzafaf.pdfIn PDF document text
    • https://cdn.sqhk.co/modesarox/bnAhfEy/90855339591.pdfIn PDF document text
    • http://mysteps.online/293360332265qcxa.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxogife/hhiebjh/zobefubakuvijabebesokob.pdfIn PDF document text
    • https://cdn.sqhk.co/banuluwopote/gjEpvhj/racing_limits_game_for_pc.pdfIn PDF document text
    • http://itsnat.space/41350713593ew6vz.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/a6giFhi/talking_lion_guard_toys.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/yigpmdA/jidofutajorikikapase.pdfIn PDF document text
    • http://bachanalytics.com/33223106094hojzw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f98113-96d5-4a2e-95e1-d7d8424a7015/urdu_language_teaching_methods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7838097c-a384-4702-bec4-86249ace8691/22800851655.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_off0000dd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4D 5324 bytes
SHA-256: bd5acb6f27a7813e1254aa50635cda88b4622681dd82b98462374870402057ba
font_01_sfnt_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 10684 bytes
SHA-256: 7fcd4ddc6a6f59b6d5d51cfc696ee4717fca6be544c472c38ea88f6a152cd740

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