Malicious PDF — malware analysis report

Static analysis result for SHA-256 a151b3dedf31ed8b…

MALICIOUS

PDF

75.1 KB Created: 2021-03-03 08:46:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 415d2ac433263a92ebe52672520b2f64 SHA-1: 4cdcbf81c2d2be4c043546f3ba08bb05d7a8fa2e SHA-256: a151b3dedf31ed8bd0e15125635c111f284225892c5c362659f52c7f174d3dda
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL is presented as a 'York heat pump manual' to deceive users. The PDF structure and embedded content suggest it's designed to exploit vulnerabilities or trick users into visiting malicious sites, likely to download further payloads.

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://dugedepap.ru/wix?keyword=york+heat+pump+manual PDF link annotation
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/9782709.pdfIn PDF document text
    • https://vulemozebo.weebly.com/uploads/1/3/4/6/134693025/babodu.pdfIn PDF document text
    • https://rutisipileriruk.weebly.com/uploads/1/3/2/7/132740940/9202569.pdfIn PDF document text
    • http://goxalajiwon.22web.org/kebozenu.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/64150139607.pdfIn PDF document text
    • http://worldworkbook.com/91815201789ykzep.pdfIn PDF document text
    • http://trokot-shtorki.online/centos_6._6_server0bh3c.pdfIn PDF document text
    • http://mavito.online/8939386084wov1a.pdfIn PDF document text
    • https://bupuzufemu.weebly.com/uploads/1/3/1/4/131452870/4443095.pdfIn PDF document text
    • http://pshcomonhere.xyz/patanjali_yoga_sutras_quotesphfzl.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/pisik/lamigaz.pdfIn PDF document text
    • http://xoxitazowakovit.rf.gd/48215003134.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/66001264385.pdfIn PDF document text
    • http://bavabime.rf.gd/36168779227.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/manugateb.pdfIn PDF document text
    • http://zizajurowetomej.epizy.com/wizelesametu.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/how_do_you_know_if_your_flame_sensor_is_bad.pdfIn PDF document text
    • http://vipuzala.myartsonline.com/79873665701.pdfIn PDF document text
    • http://felubumasosazi.epizy.com/15635470807.pdfIn PDF document text
    • http://zivosefim.rf.gd/approach_vs_method.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_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 4904 bytes
SHA-256: a228e45d4e9eb8afc3a79e786802b6924193f65a928f3583bca2de0ed4d3649b
font_01_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 10288 bytes
SHA-256: 943165a339dc29d1212924a222ae62d70a412d4f5de3daf6c08e2bea75635c0c

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