Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa4970d292b58be…

MALICIOUS

PDF

81.5 KB Created: 2021-03-23 18:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8331de89e1528063389a02744ded7a46 SHA-1: 9243fd2bda248f72c8c9d38d2cbc9b691afc37c3 SHA-256: eaa4970d292b58beb64bdce182ee5afd2ac346c47a5e7f0c3c4c0ad29e6761c4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or to host malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score strongly indicate malicious intent. The primary URL, 'https://mezovuduw.ru/wix?keyword=aluminum+design+manual+2010+free+download', suggests a lure related to downloading a design manual, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=aluminum+design+manual+2010+free+download
    • https://retotanenumu.weebly.com/uploads/1/3/4/0/134017544/fugukisavoribaf.pdf
    • http://vogatamojaz.22web.org/catalogue_games_workshop.pdf
    • https://mamudige.weebly.com/uploads/1/3/0/8/130874639/titugudunafit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://danixugikaso.epizy.com/luces_de_bohemia_anlisis_literario.pdf
    • https://s3.amazonaws.com/tomamujuf/94889036655.pdf
    • https://s3.amazonaws.com/tufitijinexu/19782515692.pdf
    • http://miviguwi.epizy.com/dozozawegolodumiz.pdf
    • https://s3.amazonaws.com/davawina/how_has_animal_research_helped_humans.pdf
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_ef2c159226c5467092db2d7e6d75b6c1.pdf?index=true
    • https://s3.amazonaws.com/resixexi/67979443586.pdf
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_47329a33437545b094f11b37e615c0d4.pdf?index=true
    • https://s3.amazonaws.com/megujobemegor/31781310477.pdf
    • http://beninoduvewer.epizy.com/kendo_grid_editor_template_validation.pdf
    • https://s3.amazonaws.com/tokit/10977810184.pdf
    • https://740e8036-3174-4dac-ae20-9eee1cd11a0a.filesusr.com/ugd/0f1c31_83ac72d594f048e480283101cedef705.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_off0000fc79.bin
b9e48b431aede93e6ecfb0fc4d9bec104d0e41efd84c898384fb239a1a9b018b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 5636 bytes
font_01_sfnt_off00010fa3.bin
97d6b05c5f447821c3cba61d3313165f1026f82fa8b6dcf08f18ffc27cceb9a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA3 12856 bytes