Malicious PDF — malware analysis report

Static analysis result for SHA-256 072bc5eda0889fc0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 07:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f0c3268123ddb101283c1afeaa08d76 SHA-1: c3e0daa2d615eb16abe8f898fd7c884596da684a SHA-256: 072bc5eda0889fc04d75f69af7af9514b04b7a23a68cc6e6952b2256d5d91c17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous embedded URLs, many of which point to potentially malicious domains, and exhibits characteristics of a link farm designed to obscure the final destination. The PDF structure and embedded content suggest an attempt to disguise malicious links within seemingly legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sineadstone.com/userfiles/file/16516178686.pdf In PDF document text
    • http://hzbmsj.com/images/upload/File/82367240260.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/dolurisideremesasozovug.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/gosutela.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/tatowivazoredegakirirokav.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/86939826677.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/7525601037.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/9341128252.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/japametixuz.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/84001616421.pdfIn PDF document text
    • https://aneri12.cz/res/file/50504053838.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/xokasizapapas.pdfIn PDF document text
    • http://blgjad.com/upload/files/pipovofobemixigelegebane.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/34156503235.pdfIn PDF document text
    • https://yasacompany.com/upload/files/xakufetejaloto.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/44715353586.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/6392700900.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/xamudinejofisuzodato.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/vixep.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/87181947253.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/dizirijozuwuvesawejolu.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/wupoxobod.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8f241b188---pomojovakijuvek.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130675d807a4---morilulivebuwomaxibi.pdfIn PDF document text
    • https://securitydm.com/slicice/file/xegagatiziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=photoshop+tutorial+book+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_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 10692 bytes
SHA-256: 62dd66b91fc65761b50b69e2c99524640a47f5f27509bc9c8acba9411e5102f3
font_01_sfnt_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 18028 bytes
SHA-256: 6e5d186c282822331c011bbd052d4c3aa22c4f8e84cc0315a0883642cbafd947