Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc128d87fd5fdc04…

MALICIOUS

PDF

80.3 KB Created: 2021-03-31 02:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 00dd76a8a839856807fddbbddb7dc970 SHA-1: 8328e5316b99c25e4d90cbfb1ae25d6826dc89a8 SHA-256: bc128d87fd5fdc049b9675285c04a062c9af64f4031256cb44b468fb006e6f01
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jacksth.ru/wix?keyword=chapter+3+accelerated+motion+answer+key PDF link annotation
    • http://lajafago.medianewsonline.com/family_bunker_plans.pdfIn PDF document text
    • http://my-favshoph.online/metaxoketapon2cq7x.pdfIn PDF document text
    • http://saporik.scienceontheweb.net/vuzolawima.pdfIn PDF document text
    • http://pedugubugof.mywebcommunity.org/biomasse_energie_renouvelable.pdfIn PDF document text
    • http://kevifiregerufug.scienceontheweb.net/xoledagokojasipenebi.pdfIn PDF document text
    • https://vuxuminitemup.weebly.com/uploads/1/3/0/8/130874085/9138236.pdfIn PDF document text
    • https://pinipinemijik.weebly.com/uploads/1/3/0/8/130814728/widomijoj-rusewemujawo-xagomuk-lutanedinag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380411/normal_5fdf1594b6869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_603692340a2c8.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/Rggham9/canterbury_tales_character_analysis.pdfIn PDF document text
    • http://ritixibetono.mygamesonline.org/a1013_transistor.pdfIn PDF document text
    • http://rerubin.space/gomatilibigapuxobo5y3b1.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/gctzHgd/bonhoeffer_cost_of_discipleship_study_guide.pdfIn PDF document text
    • http://gitikirazidapi.medianewsonline.com/calculus_2_topics.pdfIn PDF document text
    • https://tigopovon.weebly.com/uploads/1/3/4/2/134235173/kuwolopoze_pizutiregu.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/sopogubigawatuvegimoja.pdfIn PDF document text
    • https://cdn.sqhk.co/liripudeb/dIPGb2Y/pandemic_unemployment_assistance_massachusetts_taxes.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_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 5640 bytes
SHA-256: 4f6fe295c05b83249fa594f25633ee47d28bf94b4f0c690b6e4d9fd0383b4150
font_01_sfnt_off00010ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 10896 bytes
SHA-256: 7b9adb0fab059546eef55a6c942beb477a276c803276d5bac4eba6232f5e87f0