Malicious PDF — malware analysis report

Static analysis result for SHA-256 08deb8674d1a5c39…

MALICIOUS

PDF

88.3 KB Created: 2021-03-18 13:05:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 545fcb97ffa3d8a8b2bb91ccf3ea541f SHA-1: 788212f246a5300f7b4126f6335f458c4433a06b SHA-256: 08deb8674d1a5c3966be568ceaf399c0a0e76f94089530bd7834d3e1f86c0ee3
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a high ML classifier score and ClamAV detection indicating malicious intent. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=how+to+use+my+study+life PDF link annotation
    • https://cdn.sqhk.co/rezejigobip/8gihehg/lodedobisujovara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381988/normal_60174515da197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467277/normal_60290da236802.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/7jbkMja/81661070759.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/D8ifij3/27208998277.pdfIn PDF document text
    • https://gimogelego.weebly.com/uploads/1/3/4/6/134601730/6b3849ed51577.pdfIn PDF document text
    • https://novesorolawo.weebly.com/uploads/1/3/4/8/134886892/6e86c2c121432d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413110/normal_5fcc5c3ab3e1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447641/normal_6001711e93e7e.pdfIn PDF document text
    • https://rimidewazasi.weebly.com/uploads/1/3/4/3/134317879/3646056.pdfIn PDF document text
    • https://cdn.sqhk.co/lowilufape/KLhjjcH/basketball_scoreboard_program_free_download.pdfIn PDF document text
    • https://fejevudud.weebly.com/uploads/1/3/2/6/132695511/paresol.pdfIn PDF document text
    • https://novuwujuvum.weebly.com/uploads/1/3/0/7/130776589/nijexuk-moxanerekuxa.pdfIn PDF document text
    • https://ladifibefumuxuw.weebly.com/uploads/1/3/4/3/134353250/21d9b6bf16b4.pdfIn PDF document text
    • https://cdn.sqhk.co/salasereki/hcig5ii/libojiroxekawazekobovoxaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_c20a7407fec84f399d2c6cc7e9a4efe5.pdf?index=trueIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_883113ee8769494d990db84f25463871.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gewisetug/56028784607.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/10720194733.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_502ce1db834c404ca0812745761b67f4.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_f7ceb802e31d499681dced9e9521a530.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/pejowagijonefe.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/24104482200.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/adventure_java_games_phoneky.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 3812 bytes
SHA-256: 57169efebeec3e3ff59187b68f63d1abd19ac39d57b57935ef7d4f9f14f0fad8
font_01_sfnt_off00010c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C76 4676 bytes
SHA-256: ae34e72f50e0f1e76e2fae282b0abd9bb6a5408c0d93a0f6859ded532af5eef9
font_02_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 11676 bytes
SHA-256: a6882dcf4c4bd22970c3fbe075ba29f567502f62e3dddb320b34ac0bbb9be4b0
font_03_sfnt_off0001438c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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