Malicious PDF — malware analysis report

Static analysis result for SHA-256 f591f0166df97a29…

MALICIOUS

PDF

76.6 KB Created: 2021-02-27 09:22:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d10656b85fa020b6596269cc37b9559 SHA-1: 53be0c89e6127ce35a01083288ef0df5f5656b15 SHA-256: f591f0166df97a299051cf63f666686c619ef37bc5fccef6b07d8e963e3b9d04
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. ClamAV and ML classifiers also flagged this file as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the overall structure strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/123?utm_term=is+the+ps4+gold+headset+good
    • https://nupimixek.weebly.com/uploads/1/3/2/7/132712066/napeduxi.pdf
    • https://cdn.sqhk.co/vulovosovem/eDGjgjj/gozima.pdf
    • https://zanixikowupu.weebly.com/uploads/1/3/1/4/131437740/wogelopujazap.pdf
    • https://cdn.sqhk.co/tamupoto/VtjaQih/syfy_app_not_working_on_apple_tv.pdf
    • http://mufutekuson.getenjoyment.net/emil_and_the_detectives_movie_cast.pdf
    • https://bafibosu.weebly.com/uploads/1/3/0/7/130738803/wuxekomoxino_donekij_wurazizulibariz.pdf
    • http://zutatowatipo.mywebcommunity.org/homelite_lr5500_generator.pdf
    • http://fejukoturig.medianewsonline.com/music_theory_for_dummies_guitar.pdf
    • https://cdn.sqhk.co/xagaxubibiz/bnheBuj/homecraft_home_design_game_apk.pdf
    • https://cdn.sqhk.co/woxemumi/jiEuIgh/vadunifog.pdf
    • https://cdn-cms.f-static.net/uploads/4385014/normal_6019d8799f802.pdf
    • https://cdn-cms.f-static.net/uploads/4427094/normal_602007df225dc.pdf
    • https://cdn.sqhk.co/jotapepikota/jEwha7i/15211789509.pdf
    • https://cdn.sqhk.co/pufowuvikij/nPkib6N/pandemic_isolation_mental_health.pdf
    • https://cdn.sqhk.co/bitomasijelo/jTZjhgc/among_us_guide_tips_and_tricks_deutsch.pdf
    • https://pomudimukiribob.weebly.com/uploads/1/3/5/3/135313003/tosumopapolobax_wujomabiwelef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wetowuzuxit/exhibition_invitation_email_template.pdf
    • https://s3.amazonaws.com/seriposuj/autohotkey_recorder_free.pdf
    • https://s3.amazonaws.com/bolovopizonuki/microsoft_sql_server_2016_enterprise_free.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_off0000ef9c.bin
986662d66a97e73b7865a08ae89e3429744e008a1cfb64e076b873bd1ffc8b78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 5152 bytes
font_01_sfnt_off00010127.bin
27ea844c704664a72b2217e8ce4ff979ae4d43b52f290a0aab84527352aeef5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 10576 bytes

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