Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cc042c30a0a437…

MALICIOUS

PDF

75.3 KB Created: 2021-04-09 17:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 74f71689c502edbeec85fff61ca0708b SHA-1: 2a163b9bab8fe049bbf281595e1e53cc9d1ad546 SHA-256: b8cc042c30a0a4379160514921351508f82603acb921dc2279e49374590bd75a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a remote support tool lure. It contains numerous external links, including one to 'kuzutuzo.ru', suggesting an attempt to direct the user to malicious content or downloads. The document's structure and embedded links indicate it is part of a phishing campaign designed to trick users into installing potentially harmful software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://kuzutuzo.ru/strik?utm_term=which+type+of+space+heater+is+safest PDF link annotation
    • https://libufuvebugun.weebly.com/uploads/1/3/1/4/131406816/tevakokexapefad.pdfIn PDF document text
    • https://vobulesije.weebly.com/uploads/1/3/1/8/131857334/05373ae3d2971e.pdfIn PDF document text
    • https://nexojavadu.weebly.com/uploads/1/3/0/7/130775828/koliruz.pdfIn PDF document text
    • http://gunisone.iblogger.org/91112810306.pdfIn PDF document text
    • https://biwoponafi.weebly.com/uploads/1/3/4/7/134767969/1810567.pdfIn PDF document text
    • http://wuvudazesog.22web.org/36731591955.pdfIn PDF document text
    • https://ruletovijijiz.weebly.com/uploads/1/3/4/6/134602869/db72677.pdfIn PDF document text
    • https://remofixar.weebly.com/uploads/1/3/0/7/130776049/nebuginajaxitu.pdfIn PDF document text
    • http://pofuvize.iblogger.org/80112244636.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/1a129ec0c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/862763fb-38d5-4c77-9661-e53259a78fcc/zigaso.pdfIn PDF document text
    • http://kilatigavof.rf.gd/nanodarutizanoki.pdfIn PDF document text
    • http://povemuxituziv.epizy.com/review_of_clinical_anesthesia_download.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/tanebibalizenelewa.pdfIn PDF document text
    • http://pegowalinasaduk.rf.gd/guitar_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/how_to_set_sony_icf-c218_clock_radio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f0710f9-afb9-4cb3-9734-a4a3c4e4728f/glory_in_death_jd_robb.pdfIn PDF document text
    • http://tewenusewokux.rf.gd/10527506671.pdfIn PDF document text
    • http://zodabozaloti.rf.gd/30938766812.pdfIn PDF document text
    • http://perurafofasiw.epizy.com/pukamerovibiwowex.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/kalavusebu.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_off0000e86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86E 5188 bytes
SHA-256: 615223e45d9e1ab0c7ae2a5f51f7e8e54053e147baf9eee5e397fbe271768d5e
font_01_sfnt_off0000fa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 10600 bytes
SHA-256: 3e7dd9077a7bd5b77b11ff0dedc8ead25d0627dbf7778d993785913f931f8462

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