Malicious PDF — malware analysis report

Static analysis result for SHA-256 e416bf71165f2738…

MALICIOUS

PDF

71.4 KB Created: 2021-04-05 14:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e11db1e29f6bc4c17dd1ae3b243fc3e9 SHA-1: 9b69fb06444b0f8d17859e28ea5436f56144662e SHA-256: e416bf71165f2738d8e92c18866663d8751efbfc86f6cb4b1b1f195f470f3b12
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojanized PDF. It contains multiple external URIs, with a primary suspicious URL pointing to 'xajibur.ru'. The PDF's structure and embedded links suggest it functions as a link farm designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

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://xajibur.ru/123?utm_term=blackbird+alter+bridge+tabs+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451542/normal_60609422a88e2.pdfIn PDF document text
    • https://kabuvegezukab.weebly.com/uploads/1/3/5/3/135325093/pagigoxolume.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/reversible_belt_conveyor_design.pdfIn PDF document text
    • https://bixugukov.weebly.com/uploads/1/3/2/6/132680808/94a00d.pdfIn PDF document text
    • http://sotarebesowula.medianewsonline.com/81305876352.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419441/normal_5fed0fe3cae74.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/hari_arora_applied_mathematics_3.pdfIn PDF document text
    • https://xonajababivoxo.weebly.com/uploads/1/3/4/0/134040492/c3bc83.pdfIn PDF document text
    • https://migobagola.weebly.com/uploads/1/3/4/8/134874333/8511844.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/3297591.pdfIn PDF document text
    • https://felogenapugiro.weebly.com/uploads/1/3/5/3/135327705/1858005.pdfIn PDF document text
    • http://rozewevojalel.sportsontheweb.net/bratislava_street_map.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zeviruzokosobi.epizy.com/bstc_answer_key_2020_download.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_258ca4473b984ec6a04db64813ce13c5.pdf?index=trueIn PDF document text
    • http://duwagisu.epizy.com/dusovepudesopusevuwi.pdfIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_89883c86fdea4b96ab9cea8a8ad5059b.pdf?index=trueIn PDF document text
    • http://nekaxikafixof.epizy.com/taking_sides_book_history.pdfIn PDF document text
    • http://zuvodokisezimim.rf.gd/technical_analysis_forex_trading.pdfIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_910a958946d84fa3b96461c757365b60.pdf?index=trueIn 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_off0000ce2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2E 5576 bytes
SHA-256: de339102c8e7872788ff667859bf37de89cf2c3581d7da7c17cc632be4b3f33b
font_01_sfnt_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 15256 bytes
SHA-256: 91ec277ec1879ac0c3e95c4fc1732150aad6582d20fff55b678d9de15222897e

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