Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f48ac3e367459a…

MALICIOUS

PDF

73.7 KB Created: 2021-03-28 20:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9dcd3598b4eadbf8db7ebe86a1ae46d SHA-1: 10bfe5a19fb8a5aa817b3a0afb227691d006e571 SHA-256: b5f48ac3e367459a31a80684dcc51b69a783abc41ee94cafd01317f86c1b7141
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' pointing to suspicious domains like 'naturebiolog.space'. The embedded URLs suggest a phishing or malware distribution scheme, likely intended to trick users into downloading further malicious content or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=puzzle+farter+unblocked
    • http://naturebiolog.space/60881902161vcwaf.pdf
    • https://cdn.sqhk.co/mepowokugo/ieggf8Y/pupobefiwobutidogabaje.pdf
    • https://cdn.sqhk.co/zevolazezag/jbhhdjf/fitbit_charge_3_setup_app.pdf
    • https://cdn.sqhk.co/gabixeme/o6ichgd/libebotewinisitukibeze.pdf
    • https://cdn.sqhk.co/letopoto/jjOkAUX/coursera_machine_learning_quiz_answers_week_2.pdf
    • https://cdn.sqhk.co/nazujovo/daWjfMS/international_business_management_institute.pdf
    • https://cdn.sqhk.co/ramazunor/jeidwPJ/wizened_meaning_in_urdu.pdf
    • http://qlemelest.online/187654891756fqob.pdf
    • https://cdn.sqhk.co/kurinunuwor/7jgUjta/game_ninja_arashi_2_mod_apk.pdf
    • https://cdn.sqhk.co/rojarasam/iijewuF/mouse_running_through_house.pdf
    • http://usacarins.com/gapir7w6xz.pdf
    • https://cdn.sqhk.co/mapetidul/jhidhc3/lixupejexemedafaripekokel.pdf
    • https://ponuxarazuzega.weebly.com/uploads/1/3/5/3/135328107/7187195.pdf
    • https://wilegefozuf.weebly.com/uploads/1/3/4/3/134399327/kowuviw.pdf
    • https://cdn.sqhk.co/dojidavos/jcmhbgi/seteseletunolobol.pdf
    • https://cdn.sqhk.co/rabataxuvax/bwBruQu/predator_clock_apk.pdf
    • http://com-signto5.xyz/44008066815ztla3.pdf
    • https://cdn.sqhk.co/jasorevujoxu/iagcoib/internet_manager_6._35_build_3_crack.pdf
    • https://cdn.sqhk.co/jomububorava/6zte4c4/car_racing_games_for_pc_under_100mb.pdf
    • https://cdn.sqhk.co/rufebumu/mzhhRjc/big_bang_theory_cute_comic_book_artist.pdf
    • https://jinokafolamod.weebly.com/uploads/1/3/4/3/134310646/bb3c6d5ea67ca5.pdf
    • https://cdn.sqhk.co/nedivixozu/gcIAMrA/conception_2_bonding_events_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/mozedijiz/what_does_a_special_education_administrator_do.pdf
    • https://s3.amazonaws.com/zunaporam/honda_hrx217vka_air_filter.pdf
    • https://s3.amazonaws.com/levumoduf/92998871718.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f6.bin
e8fd17092d903b4682432fbed8f48727a860726799f05295ee36a62025351dca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 4924 bytes
font_01_sfnt_off0000e7c4.bin
bea3ab36d22ff4b15e236c8e20a15fea96f88f9ffb7f2cbbd674812663961aae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C4 10352 bytes
font_02_sfnt_off00010b2e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 4324 bytes

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