Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4428848b2bcb6c…

MALICIOUS

PDF

80.2 KB Created: 2021-03-27 23:34:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4140b88616dba83816900004d8052d4b SHA-1: 1adbadef220260fb2e8805db6ce8b4df746ca96b SHA-256: fa4428848b2bcb6c54b61ab6a62f2642151ff05ecc185c881a089d93341a92a5
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/award?keyword=rula+ergonomics+pdf
    • http://gagimubu.mywebcommunity.org/appareil_respiratoire_des_poissons.pdf
    • http://ginixotojaru.medianewsonline.com/55400741835.pdf
    • http://vonowaz.iblogger.org/good_answers_to_how_are_you.pdf
    • http://jologedeb.getenjoyment.net/86258297952.pdf
    • http://bomisedoxu.mywebcommunity.org/how_to_write_a_fiction_novel.pdf
    • http://parazepurafeza.medianewsonline.com/analysis_and_design_of_algorithms_book.pdf
    • http://xezixaz.getenjoyment.net/93251605930.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vekabun.myartsonline.com/87402428109.pdf
    • https://s3.amazonaws.com/zemigiduwagafu/gufofiful.pdf
    • http://xomewipasi.rf.gd/nitrogen_generation_system.pdf
    • https://s3.amazonaws.com/wufujudisu/silence_by_endo_sparknotes.pdf
    • https://s3.amazonaws.com/gimisorixosu/85740821248.pdf
    • http://nipimixo.epizy.com/rigokenonimatavami.pdf
    • http://zitadufafasid.onlinewebshop.net/the_rising_of_the_shield_hero_season_2_release_date_anime.pdf
    • https://s3.amazonaws.com/rupatojuko/lisomuferolozivimub.pdf
    • http://muzoxed.rf.gd/gutesaxonepexowumolufu.pdf
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_d4f4339a670a4eae9bbb986ecb6212e4.pdf?index=true
    • https://s3.amazonaws.com/nilititonawafim/aberdeen_performing_arts_discount_code.pdf
    • https://s3.amazonaws.com/xamibudasagas/37419405216.pdf
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_2f08dd4fb087422aa8189b0819a7f4fe.pdf?index=true
    • https://s3.amazonaws.com/libowebujakux/21190339268.pdf
    • http://vuxekote.rf.gd/satyanarayan_pooja_invitation_in_marathi.pdf
    • https://37dcb74a-b492-4e6c-94d7-6984b04a3d7f.filesusr.com/ugd/01eaca_6a8df7d64e3540bdbf66cc589e0628cf.pdf?index=true
    • http://lodumojokexiku.onlinewebshop.net/skyrim_se_best_wabbajack_mod_list.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e654.bin
5cf10c163c56adf0945debcea3297b0eb7cbb6b51a8d417951c00d4215c0ccd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 5484 bytes
font_01_sfnt_off0000f8ec.bin
0f16d3e5bbd41ad301fe618597bdc2403ef66eb2e6ba3c740505934a899ffc88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 10820 bytes
font_02_sfnt_off00011e3f.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3F 16204 bytes

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