Malicious PDF — malware analysis report

Static analysis result for SHA-256 8421fddffc99e967…

MALICIOUS

PDF

77.1 KB Created: 2021-04-01 21:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7be79ec7f306eadc6074773a9c6761f SHA-1: 68c8d8a83f38eb74de811075b31964d7dbe18598 SHA-256: 8421fddffc99e967b3da092c879dfdf4c48ade3e188435658d55bee8423c09fd
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://leonvi.ru/wix?keyword=this+was+a+man+jeffrey+archer+pdf+free+download', is used to lure victims by pretending to offer a free book download. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links are indicative of malicious intent, likely to drive traffic or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/wix?keyword=this+was+a+man+jeffrey+archer+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4374704/normal_5fd0bc14ae2df.pdf
    • https://cdn-cms.f-static.net/uploads/4459776/normal_601f8d8cef77a.pdf
    • http://avto-document.site/chemical_bonding_review_packet_answers773im.pdf
    • http://lnstagramverifiedsbadgesforms.com/how_to_install_swann_wifi_security_camerahzanu.pdf
    • http://limelusefi.iblogger.org/wonokiketametid.pdf
    • https://cdn-cms.f-static.net/uploads/4404965/normal_604ca89ab5238.pdf
    • http://fazoluniguket.iblogger.org/damirefovaziwimir.pdf
    • https://static.s123-cdn-static.com/uploads/4474736/normal_5ffd5451eb76b.pdf
    • http://circus.market/85474591923muuuy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_bfbdc9feb7e44c7d9e1a95a9f2888ae3.pdf?index=true
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_5abe49562510450d849b82477058b272.pdf?index=true
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_8cd3090a00bc41549db81bb48849d5a5.pdf?index=true
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_d7673a040a374329bbe882ed03cc0c88.pdf?index=true
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_abf8d8f3dadc4575940df0be1adb44dc.pdf?index=true
    • https://s3.amazonaws.com/tixedujegibex/mailchimp_template_full_width.pdf
    • http://situxunekidini.epizy.com/mastering_physics_giancoli.pdf
    • https://s3.amazonaws.com/pubopelej/big_green_egg_table_cover.pdf
    • https://30bb9d03-04f1-4043-8ca4-b11f08dd7d37.filesusr.com/ugd/82ab19_f7f9a1938a01407d8149e4d996072815.pdf?index=true
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_22fc872385f24617b6732aad57b0b30f.pdf?index=true
    • https://s3.amazonaws.com/nademopor/ardaas_full_movie_mp4_hd.pdf
    • https://s3.amazonaws.com/pidufozu/guidelines_european_glaucoma_society.pdf
    • https://eb9d0a7c-f241-4274-9260-18def620c3fd.filesusr.com/ugd/796b85_93451631416d4b9199736b3f4ef62e4a.pdf?index=true
    • 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_off0000ee21.bin
dfe1f8d0368a2a4e2e03ed296d9cc73d54627d2dcad360bfb62e55cfd77de33c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 5612 bytes
font_01_sfnt_off00010127.bin
24c85b05b4c4e27a921517a6010fdbc018d04a7006edc64e55022c9b1e38700f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 10976 bytes

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