Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9816379527d57fd…

MALICIOUS

PDF

92.1 KB Created: 2021-09-12 01:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d7b72461b2ab03547b6564a70a75c44 SHA-1: 2d726b8606392e7b19a06b0f8bf0292a7618b266 SHA-256: b9816379527d57fdc76a25f8d8742073145027e9fe50d1510995fd775f098607
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to domains associated with link farms and disposable hosting, suggesting an attempt to direct users to malicious content or phishing sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139987d0fc57---xokepazobekexudusobe.pdf In PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/buwukisibuxetiwik.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/suxonabusijeminivokojami.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/49638085641.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/81896705407.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/26409385270.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/13378909821.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/49753760923.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/lipuzaxajeparawugobixusi.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/84414480460.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/bikatuxikaporifoj.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/3654633826133ecd979463.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/womufev.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/rilidawoletifejotatasi.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/58615387399.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/sopuvilifawojo.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/jutimilidefe.pdfIn PDF document text
    • https://mfdesign.hu/files/file/dogiwegeguposubogidoku.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/21059328631.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/senesefufituxamekibal.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ca1cef1b0---sepozavevunedipabisasa.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/xesoforegoji.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/migemuwazaked.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/xitex.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/romotaguwosevopuwitog.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/banixubogodafativevava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=zack+snyder+upcoming+dc+moviesPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 11048 bytes
SHA-256: 493f9b884f7f460d7aca5cb7851008d5a68996466b46fa0bba52754cca75eee8
font_01_sfnt_off00011aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA4 18412 bytes
SHA-256: d282f0b5c3cfe3160c33fc27ad2b189dcd6c394164c1b9a002e986ba6e083196
font_02_sfnt_off00014a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1