Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2b2fa85c85079f…

MALICIOUS

PDF

75.5 KB Created: 2021-09-21 04:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7da5a89526a0038a23c7bd1decda0756 SHA-1: 2d5d2f0aae23bd5a8070d2b1fb79f65cf65c9bc0 SHA-256: 9a2b2fa85c85079fbbf286309f543f0d800096d3e11340bc82cdaaaa26014ea6
126 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many pointing to suspicious domains, and a heuristic identified it as a link farm on disposable hosting. The PDF structure and embedded links suggest an attempt to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kuepancong.com/contents/files/83976186742.pdf In PDF document text
    • http://inbiosa.eu/static/cfiles/files/81323652038.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/69992096225.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/25700180614.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/24761516114.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/parudavab.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/dazaneniwujilovajanob.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/h9igk9ik02r73mhmr3ef83h22o/rekaxoris.pdfIn PDF document text
    • http://rafaelokazakov.com/file/bilomapulojujufupo.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/5249278085.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/rowivez.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/benorarexenibolup.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/72346475829.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9cefd7cce8e6b8f16ea2d06d66d4cd1e/94194031061.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/nolakiboreto.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/80797697865.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/55421710771.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/zanodowut.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/wufiviji.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/bizakolekusediwewisilo.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/82461955787.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/44477210500.pdfIn PDF document text
    • http://erictex.com/ufiles/files/vibuxovet.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/37264700929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=shopping+cart+hero+5+mod+apkPDF 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_off0000b982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB982 11048 bytes
SHA-256: ce588c5124430f60841570c97a09ac599c8d760bd5f35fda94ca36fb96199299
font_01_sfnt_off0000d2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EE 19480 bytes
SHA-256: 0638756652c2ae6bacdabed109780ca76dabcea87162fe3d47ada1c802bd7889
font_02_sfnt_off000105ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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