Malicious PDF — malware analysis report

Static analysis result for SHA-256 986277f4a1c84e0c…

MALICIOUS

PDF

76.0 KB Created: 2021-05-26 06:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec7e781f2c50ce002d62d9f5a384a3e7 SHA-1: 1c04745f6ff72df6156cc4fb55503a36df013afc SHA-256: 986277f4a1c84e0c17e6a773438e272fd4bee3854ce39b4c3cb920b456fe2a1a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The primary URL, https://kuzutuzo.ru/strik, likely serves as a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kuzutuzo.ru/strik?utm_term=game+online+nh%25E1%25BA%25B9+m%25C3%25A0+hay+cho+pc
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/335389.pdf
    • https://kewegiru.weebly.com/uploads/1/3/1/4/131438086/fiforawogobob_kekoforul.pdf
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/xipoweripiradomusi.pdf
    • https://raxagipob.weebly.com/uploads/1/3/4/8/134883443/094a6064262d.pdf
    • https://jovanifapekiba.weebly.com/uploads/1/3/0/7/130739678/73fb9ad5.pdf
    • https://xebejadeveroj.weebly.com/uploads/1/3/0/9/130969735/4906565.pdf
    • https://zinobelusetepi.weebly.com/uploads/1/3/5/3/135318062/wukuxopixorexuf-nifabuwesaz.pdf
    • https://femixazate.weebly.com/uploads/1/3/4/3/134363246/fukemegodose.pdf
    • https://nodikakubal.weebly.com/uploads/1/3/5/9/135966501/modofatito.pdf
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/siwumefu.pdf
    • https://tokegomobox.weebly.com/uploads/1/3/4/3/134314144/julewumedosikigaxe.pdf
    • https://zaxalaxixu.weebly.com/uploads/1/3/1/6/131606365/20221c8.pdf
    • https://zewogamiwivu.weebly.com/uploads/1/3/4/3/134313422/julawupulugidisuxaf.pdf
    • https://fapifejoj.weebly.com/uploads/1/3/4/2/134265577/mojenem.pdf
    • https://bumudipokipilu.weebly.com/uploads/1/3/4/3/134350227/5023015.pdf
    • https://boretenewur.weebly.com/uploads/1/3/1/4/131453221/ab8b4.pdf
    • https://kupujusurigov.weebly.com/uploads/1/3/4/4/134471221/pilule.pdf
    • https://mazerobuwi.weebly.com/uploads/1/3/1/3/131398334/latidufu_sapobefofebaxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fadobirak/cv_format_for_accountant_job_in_dubai.pdf
    • https://s3.amazonaws.com/fusopoxipo/character_profile_worksheet_ks1.pdf
    • https://s3.amazonaws.com/fakuguvil/treatment_of_chronic_boutonniere_deformity.pdf
    • https://s3.amazonaws.com/ritoma/zulevufotapu.pdf
    • https://s3.amazonaws.com/woxotopapozokev/following_h_s_guidelines.pdf
    • https://s3.amazonaws.com/lusabifef/doxosukeboxodopiji.pdf
    • https://s3.amazonaws.com/mokamoba/interview_questions_for_employers_template.pdf
    • 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_off0000ebe7.bin
1d8e8183aef8e11b75029e82e80513324eecedcdb44441ffe7781fceaebef769
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 5400 bytes
font_01_sfnt_off0000fd5b.bin
5dbc830c29d5dc2762017cdc0a752f2ef8d331952845c4b11f7868ce7836024b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5B 10288 bytes