Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46d0ac07aebbe75…

MALICIOUS

PDF

74.7 KB Created: 2021-03-16 03:47:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff0dafb1697a20dd1851f2ea53736223 SHA-1: 77944d8f82b32cb01c947b1f5c71252a972c97f2 SHA-256: f46d0ac07aebbe75859347489f128326f76ab7ad55a640c235384debc53ad8a9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and it contains a large number of external links, indicating a link farm or redirection strategy. One of the primary URLs, 'https://zajinet.ru/strik?utm_term=stealth+cam+stc-p12+setup', suggests a lure related to 'stealth cam setup', potentially a phishing or scam attempt. The presence of embedded URLs and the PDF structure strongly suggest it's used as a delivery mechanism for malicious content hosted elsewhere.

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-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://zajinet.ru/strik?utm_term=stealth+cam+stc-p12+setup
    • https://kusuxifitumaka.weebly.com/uploads/1/3/4/5/134593182/nelozen_vixaf_rujuwuniw.pdf
    • https://rinixupikexem.weebly.com/uploads/1/3/4/0/134096042/godanoveb_pevam_xunofozulotesu_sitatuvilev.pdf
    • http://soldonlittleton.com/lubuxilobanaluvh0o60.pdf
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/dojatosanonux.pdf
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/4319366.pdf
    • https://xedawazusaxe.weebly.com/uploads/1/3/2/3/132303108/4cb4cb1fce.pdf
    • http://apeech.ru/guild_wars_2_dungeons_guidenrq8k.pdf
    • https://torufiwatus.weebly.com/uploads/1/3/5/3/135312416/5710179.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zaxawetawupo/gangster_bollywood_movies.pdf
    • https://s3.amazonaws.com/kelageketisefuv/vanaw.pdf
    • https://s3.amazonaws.com/genedesowul/kewopa.pdf
    • https://s3.amazonaws.com/dutimajizowa/sipoz.pdf
    • https://s3.amazonaws.com/seriposuj/wef_travel_and_tourism_competitiveness_report_2016.pdf
    • https://s3.amazonaws.com/rimepusox/aulad_bhojpuri_movie_songs_free.pdf
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_d6685a1bfced4563aa1f23f2c57af882.pdf?index=true
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_7a4332eff33e4175bc80b6ffcf55d6ec.pdf?index=true
    • https://s3.amazonaws.com/xojafemori/82426389001.pdf
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_954b8f519fa14e93946f061f2c1d87b4.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_off0000e656.bin
5d5437aa16b8f5ddbf8e70f547bae941110dd34daf2caac86bf132fa90f9d55b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 5396 bytes
font_01_sfnt_off0000f898.bin
c80a1b7b0ea550f699c92162153a276bbfd3b6bd298b3f9634c1761b8afe852e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 11036 bytes

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