Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9e33c87b769909…

MALICIOUS

PDF

72.3 KB Created: 2021-09-21 12:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7e4302606385a7e4c616c258529ccdb SHA-1: 4bc00425bf0da92fd3e8f941554668b7007ea3dc SHA-256: 1a9e33c87b7699090edcfefbf7aa9be69d280140758b1aae8046c3c6c39fcda8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=tls+tunnel+pro+apk+download PDF link annotation
    • https://atputasbaze.lv/images/userfiles/files/jivogoxejebujunafovano.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210901_2CD079FF8205F0DC.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/varuzoketamokipozigimi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/9lfbv6db4vpgdkk4hc3lu6hhbk/9769887243.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/dapijulewerak.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/92245556035.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/jixerejafujugojorozir.pdfIn PDF document text
    • http://chanassociation.org/uploads/file/73078445513.pdfIn PDF document text
    • http://tavio.su/files/file/69874399147.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/mujimifokuzakopob.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/xufuvujadufojimirugekebot.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/43974539411.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/sibevuwenafutivevujeja.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/dulafozejikubawudos.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/64654076801.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/35464966797.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/ruzeramafulirikuxegivowul.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/70528331531.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/62075589938.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/jumavuzubesurolaruza.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148dc2494621---xapogobemotixoxax.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/23982522458.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109020555509364.pdfIn PDF document text
    • 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_off0000b9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B4 16124 bytes
SHA-256: ea4d3c0c9d07028791f76d4cd594fad0d31a3f97c7e59d3cfb844125de7a54fd
font_01_sfnt_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 10536 bytes
SHA-256: 33f5e57b0f1c78d01af39f8e94f7b89216e1ea49ea4f27de599379c94a6e3b04

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