Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05b891c79ac3e42…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 22:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d528e479a8ec90904e242e55d1bea7c SHA-1: 7519b69e1e5f4a98c026a89c6c61d7c5ec814337 SHA-256: a05b891c79ac3e42765f845fcd8c471becf1d2ed1c9b1c04d2d342387343c839
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious sites, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://bertrandetgastineaudesigners.com/userfiles/file/72349224820.pdf In PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/59238019505.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/xasesinelujemufumavi.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/rogegilorewopixozerozexa.pdfIn PDF document text
    • http://pileki.com/imgup/file/xeputelupu.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/96980485378.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109101145534487.pdfIn PDF document text
    • https://vzglavniki.net/data/file/78922865407.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/43133113004.pdfIn PDF document text
    • http://fygl.net/uploads/file/110821231597.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/99443727105.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/99090862532.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/xozepevufumome.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/laxinifinekojoluvelat.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/jejamimosupukefef.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/rivigiji.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/dusegopodipiliv.pdfIn PDF document text
    • https://everestart.com/images/stories/file/bobitem.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/wemubirala.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/32938710737.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/foravefalafavis.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/xatix.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/41143324937.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/63059111553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=data+structures+and+algorithms+crash+course+pdfPDF 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_off0000c8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DB 11168 bytes
SHA-256: 6765478776d7e7c91a5e91e901f2be7c288c831cee58fa6cc88d51a79ad0d36d
font_01_sfnt_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 18152 bytes
SHA-256: f06dd20ff7c695c8e5970130470c370d0f0619849111dca518e5d6d1ce5888a4
font_02_sfnt_off000111d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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