Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b99969f535c73f4…

MALICIOUS

PDF

78.1 KB Created: 2021-06-09 15:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e31b7f03e9f0b0ed720b70689f0a848 SHA-1: 745afcdbbdf304fbfc101eacffc14519c3875451 SHA-256: 1b99969f535c73f45c24787259a4a9d2f6fd1e58bed3a78a313f5b431d042985
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a large number of external links, many pointing to other PDFs, suggesting a link farm or distribution network. The document body, though heavily obfuscated, appears to be related to movie downloads, aligning with the 'remote-support tool lure' heuristic which indicates a pretext for user interaction. The primary IOC is the initial URL used to lure the user, which likely leads to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://irlanc.ru/pbw?utm_term=underworld+awakening+full+movie+free+online
    • https://cdn-cms.f-static.net/uploads/4491686/normal_603cf0482ee05.pdf
    • https://jigerilo.weebly.com/uploads/1/3/4/7/134702464/wonubokelagi_xosapekamog_jazokopun.pdf
    • https://cdn-cms.f-static.net/uploads/4453332/normal_604b14f5b75a3.pdf
    • https://static.s123-cdn-static.com/uploads/4369161/normal_5fc69a47adc4f.pdf
    • https://cdn-cms.f-static.net/uploads/4412382/normal_6011e78a4b922.pdf
    • https://cdn-cms.f-static.net/uploads/4412573/normal_601442a347121.pdf
    • https://static.s123-cdn-static.com/uploads/4456663/normal_5fefc5ad62f71.pdf
    • https://static.s123-cdn-static.com/uploads/4487902/normal_5fe4fe5e1b9b5.pdf
    • https://cdn-cms.f-static.net/uploads/4479675/normal_60464535ed27f.pdf
    • https://cdn-cms.f-static.net/uploads/4494681/normal_604280fad1a0b.pdf
    • https://static.s123-cdn-static.com/uploads/4464870/normal_5fc8ff61cd671.pdf
    • https://static.s123-cdn-static.com/uploads/4455886/normal_5fcaaec43746d.pdf
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/jazumux.pdf
    • https://ruzetutenu.weebly.com/uploads/1/3/4/6/134633181/zusojujovatupotoni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tefimemovem.pbworks.com/w/file/fetch/144661179/98546084683.pdf
    • http://lesokulovisu.pbworks.com/f/66520243348.pdf
    • http://jawegele.pbworks.com/w/file/fetch/144949362/cambridge_preparation_for_the_toefl_test_5th_edition_free_download.pdf
    • http://jitilabajeko.pbworks.com/w/file/fetch/144520677/kuppet_portable_washing_machine_how_to_use.pdf
    • http://jivevisubido.pbworks.com/w/file/fetch/144600933/tabla_de_equivalencias_milimetros_pulgadas.pdf
    • http://bopelijexuf.pbworks.com/w/file/fetch/144642963/21345667154.pdf
    • http://minuwaxiper.pbworks.com/w/file/fetch/144515613/27505546298.pdf
    • http://xobapotowi.pbworks.com/w/file/fetch/144661536/manual_de_discipulado_para_nuevos_creyentes_guillermo_maldonado.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_off0000f346.bin
f9af1e548e71d8a77440d6ab5040362e362f7787fb96ed6b881ba93ee243fd28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 5256 bytes
font_01_sfnt_off00010531.bin
fe9b1e85532171c9fdc6e892faeaececdca4c34df4043f0c98ca81a853d18565		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 10916 bytes

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