Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f99f02a4d9b7aa…

MALICIOUS

PDF

73.0 KB Created: 2021-02-16 20:21:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 28c8decd825a804d0ca2c632e3f75aab SHA-1: fa2b7855bbb5ba9f1e3e354bd6fda5456780afc6 SHA-256: a4f99f02a4d9b7aae9c1605f2569e67455d56d050e35dda1486ec0af136554c8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obfuscate the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to salary, suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=how+much+does+an+electrical+project+manager+make PDF link annotation
    • http://libertinemodels.com/end_report_card_comments1fx0k.pdfIn PDF document text
    • http://spain50off.info/arpeggione_sonata_euphonium_sheet_musicqpneh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420248/normal_600dfed387cda.pdfIn PDF document text
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/wimarojaxegugerez.pdfIn PDF document text
    • http://luduloze.iblogger.org/igbo_catholic_choir_songs.pdfIn PDF document text
    • https://tivubolo.weebly.com/uploads/1/3/1/8/131857038/1853382.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390996/normal_6002eb4e626fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374372/normal_5fc57ccb6c25a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392868/normal_5fdc389f08194.pdfIn PDF document text
    • http://podcard2020.site/captain_marvel_4k_trailery0tgl.pdfIn PDF document text
    • http://1xbets-reg.site/35122151183h1fp2.pdfIn PDF document text
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/70ca2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lebaxa/safety_data_sheet_for_creosote.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/basufezulujopumeni.pdfIn PDF document text
    • http://tevufojetuxovud.rf.gd/power_of_information_commission.pdfIn PDF document text
    • http://segixiw.epizy.com/79215812647.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/courier_website_design_templates.pdfIn PDF document text
    • http://pepebejawu.epizy.com/return_path_deliverability_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/9865946032.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 5680 bytes
SHA-256: ae5ca7626c3c7bf912f2a0b3d495737914c3238f6da93f9218827ab69de8228d
font_01_sfnt_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 10532 bytes
SHA-256: 8c5e1eb9e28b259920987ea815f3e96d133e4cbbbd90d154cd6836ea377b8d9b

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