Malicious PDF — malware analysis report

Static analysis result for SHA-256 b182922d04160f3d…

MALICIOUS

PDF

68.3 KB Created: 2021-03-01 09:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6cb55b608606f2a91152aa5648d87c3f SHA-1: cc7ab665d6b9c23d3dcb6642f773745a418f956b SHA-256: b182922d04160f3dee292898aa5e8c5da69f8015b55e5f908d964f6b59a42ac8
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to redirect the user to malicious content. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

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://baarspo.ru/award?keyword=applied+regression+analysis+and+generalized+linear+models+solutions+manual PDF link annotation
    • http://power-guard.shop/muzupifijafodisod995.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/76126539448nnn18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464078/normal_6035d2c123312.pdfIn PDF document text
    • http://myluckywin.site/the_carrot_seed_summaryexptz.pdfIn PDF document text
    • http://mjawebdesign.net/music_and_movements_activities_for_toddlers9qb6s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421937/normal_602f32014cf17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_5fe967ca13a9b.pdfIn PDF document text
    • http://graatorama.space/witejujitodefajixabefuir27g.pdfIn PDF document text
    • http://sfr-webmail.com/bossetti_sentenza_appelloteqcm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495055/normal_602b85c9f04a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvodix.myartsonline.com/can_you_take_the_written_driving_test_online_in_mississippi.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/bertelli_1947_sheets.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/2009_can_am_spyder_owners_manual.pdfIn 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_off0000cbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDB 5420 bytes
SHA-256: dd94fc60918425bc83e2955419505e4e921cd8686e75ce5d17583c038ca6c0d3
font_01_sfnt_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 10352 bytes
SHA-256: a1462dacb9708352556be488468b33ca96a46f08883db89e33cfac683ea0c078

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