Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e45a3d34360f86…

MALICIOUS

PDF

78.7 KB Created: 2021-03-20 01:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36863524b7687cfdc5cd62d311a62f01 SHA-1: 9be6ba69c66e9e7f14b335055b9767737ab4364d SHA-256: 31e45a3d34360f86ee98028c82c2432b87c0d9e5d3a784d091e2a0deda070831
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of the ClamAV detection 'Pdf.Phishing.Trojan' and the ML classifier flagging it as malicious strongly indicate malicious intent. The document body, though partially corrupted, appears to be a lure related to song lyrics, designed to mask the malicious redirection to numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=tere+jaisa+yaar+kahan+arijit+singh+lyrics
    • http://baby-slings.ru/boxuzuvewsq1gk.pdf
    • http://gakmancreatures.ru/agriculture_biologique_au_camerounmf4lw.pdf
    • https://sovanomi.weebly.com/uploads/1/3/5/3/135337195/pubip.pdf
    • https://cdn.sqhk.co/tusufawenu/d9O6e8G/losewusunogizenup.pdf
    • https://cdn.sqhk.co/wujugojuse/icWGJjj/jetebomegej.pdf
    • http://keriwebuw.22web.org/algebra_objective_questions_and_answers.pdf
    • http://glawerry.online/hopper_3_with_sling_user_guide1opg3.pdf
    • https://cdn.sqhk.co/kavatupopum/yggmhcW/28863923560.pdf
    • https://pikotawikeju.weebly.com/uploads/1/3/4/4/134496208/6072037.pdf
    • http://introdom.ru/dewalt_pressure_washer_instruction_manualefxxg.pdf
    • https://muzuxagofonokow.weebly.com/uploads/1/3/1/4/131406885/8514300.pdf
    • https://cdn.sqhk.co/ritafase/DkieMgg/portal_pinball_groupon.pdf
    • http://jarizodej.22web.org/95257231486.pdf
    • https://cdn.sqhk.co/durotula/giiKhNZ/53444719053.pdf
    • https://cdn.sqhk.co/pegipoveridi/hgjdtid/pupenaso.pdf
    • http://bluebadge-support.com/can_you_get_into_grad_school_with_an_f_on_your_transcriptu5zbn.pdf
    • http://de-bewertung-id2842384.icu/beginner_running_schedule_for_half_marathon5zj1b.pdf
    • https://cdn.sqhk.co/xidafigutoxa/hghj3gd/glow_hockey_gratuit_application.pdf
    • http://interbank.link/calculus_early_transcendentals_7th_edition_solution_manualqfmk4.pdf
    • https://cdn.sqhk.co/motanunika/ebibrji/42685469547.pdf
    • http://pearhaidhr.fun/88657758455mob4n.pdf
    • https://cdn.sqhk.co/sozimelizak/hh4iehb/24894239829.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bibarixe.epizy.com/english_present_tenses_exercises.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_off0000ea40.bin
3088aea8c5b9b2d7da32ff64008d32643a167e80d31892efdff7b2178c2346b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 4928 bytes
font_01_sfnt_off0000fb00.bin
3b0b6b61ead418cdc501dd8fb3b36d99e3a366f715b1eaf86e32d58123f6a8df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 10536 bytes
font_02_sfnt_off00011f27.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F27 4324 bytes

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