Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4e2fb45abddad3…

MALICIOUS

PDF

72.1 KB Created: 2021-03-21 09:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6aeeaa083747f78f9d29d7ac069e3d3 SHA-1: 51012868ce88cefe01f66b8d57edcfac0a04102b SHA-256: 7b4e2fb45abddad3fe696b89808dc532cfbc84196284fb3a2f25ee7bd77debef
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious websites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=temperature+conversion+worksheet+answer+key
    • http://doweryklkq.space/33813402136j7euz.pdf
    • https://cdn.sqhk.co/betarudigi/1zVhfUd/hd_hollywood_dubbed_movies_2019.pdf
    • http://thelandofbadideas.com/dell_inspiron_n7110_drivers_windows_7_64_bit_download0egnb.pdf
    • http://monubagujizud.mywebcommunity.org/letter_writing_format_in_english_formal_and_informal_download.pdf
    • http://wide-do.top/java_android_game_tutorialc5qtk.pdf
    • http://lixejinokegiror.22web.org/how_to_make_burgers_on_cuisinart_griddler.pdf
    • http://senteber.site/what_does_it_mean_to_have_scheduled_maintenance5vsf9.pdf
    • http://gesabagipo.22web.org/best_place_to_donate_clothes_new_jersey.pdf
    • https://cdn.sqhk.co/datolabevev/eijideS/28008592635.pdf
    • http://respect-ltd.su/mini_borescope_for_androidjzw3i.pdf
    • http://abreudesigns.com/10465068632wxb5s.pdf
    • https://cdn.sqhk.co/loxowopiv/XigeigJ/dr_driving_game_download_hack_version.pdf
    • http://kurs1.xyz/glass_sword_chapter_8eqjms.pdf
    • https://cdn.sqhk.co/detateseb/0gegghf/bike_impossible_tracks_race_3d_motorcycle_stunts_download.pdf
    • http://ledy66.net/wilodot30bzt.pdf
    • http://datab.vip/sajaxbitfk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vebusatoro.atwebpages.com/what_animals_need_to_survive_video.pdf
    • http://kavuduvolilazod.myartsonline.com/5_canciones_faciles_para_guitarra.pdf
    • http://bolesumedinix.rf.gd/jakatesinideluzinef.pdf
    • https://uploads.strikinglycdn.com/files/9f91c207-067f-4504-837a-ba0ea1409453/wuzunorukadaxuzizinuviwof.pdf
    • https://uploads.strikinglycdn.com/files/4c1f0942-0121-46e1-835e-776665842c1b/media_relations_definition_and_examples.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_off0000dcc7.bin
55af87dc9059fd201754c2354fbd946c5a277659367abaab73128bc355ee5885		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 5408 bytes
font_01_sfnt_off0000ef17.bin
69d54d30cd98e94e6d00ba1b1c90105d532721ce457be510044ed1907e3384a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 10524 bytes

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