Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b342bd325b0653…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 23:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 249dff865ebbee11e5d2278f8ade123a SHA-1: d730667dab7cdda583a78cf578bf410b1c27ebfa SHA-256: 45b342bd325b06532b0c686e15ce1a49a2b1f2951f33561475282d4bc0c161af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic identified it as a link farm. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://domuran.pl/files/file/wojad.pdf In PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/47193773138.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/91721552887.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/85558791104.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/merosifo.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/xabatedilofulo.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210909151743.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/ponoxatisinikipe.pdfIn PDF document text
    • http://wohntraumgmbh.at/fupuwuxumiv.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/73636266518.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/jopemev.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613732e61f06b---1182934465.pdfIn PDF document text
    • http://moretonassets.net/userfiles/novixebiwes.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/13786015720.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/77716216376.pdfIn PDF document text
    • http://potlista.com/file/files/kagesowofip.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/fojisetomizif.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/699563758.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/zukizatonuk.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/sudin.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/nokavojezajuzila.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/2223232795.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/ruwuremaxidobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=play+itunes+music+on+androidPDF 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_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 16996 bytes
SHA-256: d13b3b9fbcc5d982d6a99e6cfecd80e3b7921a09b7a05d23476b5df669a58cb1
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 10744 bytes
SHA-256: b84a200bf0cf0f60578df9805f8a5c49e13a571ec3ea7a42febcaa8b081bd2b5
font_02_sfnt_off00011beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1