Malicious PDF — malware analysis report

Static analysis result for SHA-256 4214dd23494d26eb…

MALICIOUS

PDF

103.8 KB Created: 2021-04-09 08:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3f2d98e55e009181021dad0ff8422619 SHA-1: 22402cad069f7615d74d6aae9d793e0689b8fa36 SHA-256: 4214dd23494d26eb1a68ca0397236cb42610d5b8e811c25e4a93ee91e7bc91d5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV. The 'SE_CLICKFIX' heuristic indicates the document employs social engineering to prompt the user to execute a command, likely to download and run a secondary payload. Multiple external URLs are present, suggesting a distribution or command-and-control infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://leonvi.ru/strik?utm_term=how+to+speed+up+your+pc+with+cmd PDF link annotation
    • https://cdn.sqhk.co/letojeka/ljshjsP/universe_silver_card_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454691/normal_605c204ef2aff.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/whaeIij/arcade_dragon_game.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/descargar_counter_terrorist_2_gun_strike_hackeadovh06h.pdfIn PDF document text
    • http://kefets.xyz/old_spaceship_arcade_gameso18l2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457000/normal_6054e5dc7f813.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426424/normal_5fe518c909ae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385852/normal_600c8a04040b4.pdfIn PDF document text
    • http://kneeksi.ru/4580820098182emy.pdfIn PDF document text
    • http://tovelksa.website/62069346910xnzta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_5fd6fec7de8c9.pdfIn PDF document text
    • http://sweetygirl.club/chori_chori_movie_song_mr_jatt86ncv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448750/normal_5fe7ea47f3438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_600deae4afe82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_600aa14eab9ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374682/normal_6007db7065f3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_603854782390c.pdfIn PDF document text
    • https://cdn.sqhk.co/bozogekeji/UlBZMie/arany_janos_walesi_bardok_zene.pdfIn PDF document text
    • http://natgood.space/gijaxolagezn92l.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/vegozevinesowapijd1zb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491153/normal_600bfc14d8ab2.pdfIn PDF document text
    • http://a1metromovers.com/anna_kendrick_book_picturesfjj0i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000158ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158BA 5224 bytes
SHA-256: fde9ca981d4c6769ca9b961db4c9b1724ce4ec9b52c8dc204daf347a78f30cc7
font_01_sfnt_off00016a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A6E 11640 bytes
SHA-256: c99b6b554856f877dbe1cd12aaf598a7cc1a5f41053b95f7852f4695f988b5c4

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