Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fe43c56834307d…

MALICIOUS

PDF

71.6 KB Created: 2021-03-17 02:31:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe4124ac647a22c695aac514d65f2857 SHA-1: b7548f6373c2e41dcb938a90a3f3f65a89f5d72c SHA-256: 71fe43c56834307d3209a8736666240f5148e107ddee852b237254d85e10dad7
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful sites.

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://kuzutuzo.ru/strik?utm_term=what+are+the+rules+of+the+internet+reddit
    • https://cdn-cms.f-static.net/uploads/4468831/normal_6051419f7c7ba.pdf
    • http://finansi-7.online/ch42o2co22h2o_delta_ho81u1.pdf
    • https://cdn-cms.f-static.net/uploads/4451356/normal_603b5e7428a73.pdf
    • http://xilelul.iblogger.org/firefox_browser_for_windows_7_ultimate.pdf
    • http://baffer-shop.space/lies_of_locke_lamora_book_2w2dis.pdf
    • https://static.s123-cdn-static.com/uploads/4408598/normal_5ff7f7be94608.pdf
    • http://segwaywheelchair.ru/dell_precision_t5400_specs_cnetnwm5s.pdf
    • http://copyrightsupport-ig.com/58359254274y1kj7.pdf
    • https://cdn-cms.f-static.net/uploads/4416653/normal_60309273126d8.pdf
    • http://trikotoria.ru/takevufizasaxupelipewrwoex.pdf
    • https://cdn-cms.f-static.net/uploads/4382196/normal_602ef333433ea.pdf
    • https://static.s123-cdn-static.com/uploads/4370080/normal_5fe0efcb2e9d4.pdf
    • http://fadomofikupiviv.iblogger.org/peter_handke_publikumsbeschimpfung.pdf
    • http://zupezejukiselu.22web.org/what_are_the_different_types_of_iphone_10.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mokimonanogi.rf.gd/72305839041.pdf
    • http://bewimovope.epizy.com/multivariate_analysis_python.pdf
    • https://s3.amazonaws.com/jexijer/druid_archetype_guide_pathfinder.pdf
    • http://lunukujuvazer.rf.gd/turidutapekabirodezivi.pdf
    • https://s3.amazonaws.com/novifamigot/wolenavo.pdf
    • http://sedobuxekazadi.rf.gd/60419132405.pdf
    • http://talavapupaniv.rf.gd/urdu_to_english_paragraph_translation_exercises.pdf
    • http://jajojamoxarug.epizy.com/73494824042.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_off0000d95e.bin
a72e5aa784575e4aca635624ae084c005ac3f9080281821bd50f1db8c8e3e891		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 5008 bytes
font_01_sfnt_off0000ea6a.bin
6a3c7725e5fe2215c68dcbdaaa81d6ea806db9e3f33c133a4271e1981729a963		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 11516 bytes

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