Malicious PDF — malware analysis report

Static analysis result for SHA-256 b053921ea2e00cf1…

MALICIOUS

PDF

75.6 KB Created: 2021-05-09 09:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 21bd1671950a3912d4a3ce60f04dae34 SHA-1: 4af61fcffe00a09d05a7998e7be8f801f2dce6af SHA-256: b053921ea2e00cf1392144ab3666690ba9e6988602c0195b46f7ad1cdaf5ff83
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many on disposable hosting, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=serta+motion+ii+adjustable+base PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496853/normal_602072a82038f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374181/normal_5ff69511da319.pdfIn PDF document text
    • http://how2clever.com/stock_market_real_time_graphlnm70.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/nurokofegebanodisobujole.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/xanitozomaluwixaxevipega.pdfIn PDF document text
    • http://how2clever.com/54972541117nhzl7.pdfIn PDF document text
    • http://wudenufodoroziv.scienceontheweb.net/list_of_important_days_in.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482206/normal_605b8187b295b.pdfIn PDF document text
    • http://keto-s1.com/california_zephyr_timetable_20191l9d2.pdfIn PDF document text
    • http://wewofif.scienceontheweb.net/74900945390.pdfIn PDF document text
    • http://trastqort.online/ririrumapuleq4cmo.pdfIn PDF document text
    • http://gomijexa.mywebcommunity.org/numerical_analysis_mathematics_of_scientific_computing_third_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367313/normal_600675c59f85f.pdfIn PDF document text
    • http://zawukinaloluku.sportsontheweb.net/pdf_candy_pro_key.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/xurozivunuw.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/mipofefoborew.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/suwokotuzeg.pdfIn PDF document text
    • http://tesupelaj.sportsontheweb.net/bright_line_eating_vegetarian_recipes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jexamovofu.epizy.com/dopugosi.pdfIn PDF document text
    • http://zezopuvezo.rf.gd/19192356158.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/mudilo.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/22046511498.pdfIn PDF document text
    • http://dakezimipage.epizy.com/69424615090.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/89870927811.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/lepezivoruda.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 5292 bytes
SHA-256: 7876fc6a3b05eb91ce950917f2918b9eedcfe872196623f93e2493fe9aea4206
font_01_sfnt_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 11260 bytes
SHA-256: 8076ea6c50f18d4460f6340c4c684f20f29dd10afe9a7223ec2341692d92aeab

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