Malicious PDF — malware analysis report

Static analysis result for SHA-256 564a8ed65931bab5…

MALICIOUS

PDF

77.2 KB Created: 2021-02-27 04:48:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 4e5e9cfd3685378e4917907b351dc9cb SHA-1: 8155e01b834ea3dc9bb215790172f1291c4b50ec SHA-256: 564a8ed65931bab53f69cac3a59826f1770691945989744ea19b0f987656963e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable domains, and one prominent URL, 'https://mezovuduw.ru/strik?utm_term=lamborghini+gallardo+2020+interior', which is likely the primary malicious destination. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/strik?utm_term=lamborghini+gallardo+2020+interior PDF link annotation
    • http://electriccannoz.club/remington_700_long_range_6.5_creedmooru70g8.pdfIn PDF document text
    • http://tobalalupuvobiv.iblogger.org/cosine_rule_problem_solving_worksheet.pdfIn PDF document text
    • http://namedaun.fun/20413190218dnj5v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368982/normal_60055183cf9ae.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/friction_and_gravity_worksheetxh06j.pdfIn PDF document text
    • https://popaxeras.weebly.com/uploads/1/3/0/8/130814769/368739.pdfIn PDF document text
    • https://xedovederufag.weebly.com/uploads/1/3/5/3/135315932/werixedupoxop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425728/normal_602df9bff0973.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://s3.amazonaws.com/murudute/chashme_baddoor_movie_mp4.pdfIn PDF document text
    • http://togalufunepobaz.rf.gd/aggiornare_le_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/gobana.pdfIn PDF document text
    • http://zopezotudesod.rf.gd/du_admission_2019_ug_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/how_to_add_bookmarks_google_chrome_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 5204 bytes
SHA-256: 6df07354a5e5988103677697bceced0b85cab4ffe51ff19df655c4263df57425
font_01_sfnt_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 10596 bytes
SHA-256: c05e9cf97e4a5fbf06f396bf0e44c1a89646afc43e970a98e132f45f57e0f168
font_02_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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