Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf058844a2891f0…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 20:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aae01fe8ff2d78e61975fa64b7b88d41 SHA-1: 83f30007214b869994885c32a8266d8f60093950 SHA-256: 7bf058844a2891f0d821e16a2166f4bee45a24d8675f542b08f0f87cc8cc950f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external URI firings suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://blossomtour.net/FileData/ckfinder/files/20210902_07070F9B374AFFC9.pdf In PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/93586083632.pdfIn PDF document text
    • http://rongqichem.com/upload/files/11765052231.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/e81qe692r75kco5vtgbj1lc5ih/kaxagikateduwedanalagem.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/21680666032.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/34534860829.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/3292271330.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/6298723995.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/tuxukarajozugoturikev.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613182ee25084---kupulaxevopedutaniwesipe.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/netaso.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/44196382739.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/31152434200.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/zaxumibixig.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/71784427623.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/xawuwegix.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613658d8494a4---pawuxa.pdfIn PDF document text
    • https://phunhai.net/upload/files/tejefut.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/89275465653.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/wewulezaxemalokatop.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/93247888322.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/goxepinavonowidu.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/97952193276.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/wujekumu.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/bagexuboruvebonop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=thor+the+dark+world+modPDF 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_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 17316 bytes
SHA-256: 04ae304ce5e12df91af2c4934d90eaadb0bd1c0e96f23ac28ce455efc044bc46
font_01_sfnt_off00011966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11966 10292 bytes
SHA-256: 410255b150e36bffb9c9c9bc111dc24c120a54f0a481d87a32bda1b4190aeb32
font_02_sfnt_off000130a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1