Malicious PDF — malware analysis report

Static analysis result for SHA-256 94603fa0ad767688…

MALICIOUS

PDF

77.0 KB Created: 2021-09-15 23:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 79d6f32e7af88a73d156daf71bcc6da4 SHA-1: 61f55c0bd932650b3b7e31d01e4d7ccdd3fc6e03 SHA-256: 94603fa0ad767688129c1fce7df734cd9c27984d4256d0e1376422b681d28a7f
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 that point to disposable domains, characteristic of a link farm designed to host malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a deliberate tactic for distributing malware or conducting phishing attacks.

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://laborke.ru/uplcv?utm_term=swype+keyboard+app PDF link annotation
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/wugovofijuji.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/38983534555.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9950a3f1b---fifom.pdfIn PDF document text
    • http://showdoimovel.com/files/files/folozimuponiret.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/34152457861.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/84256091426.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/sixeradabavubilajul.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210912074912.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/13985075287.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/14804911498.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/mexadomilexavirizovexud.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/2416127125.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/xoxenenezeravuv.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/vazujogo.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/4084832974.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/75455516857.pdfIn PDF document text
    • http://klpa.net/userData/board/file/80061948031.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/78087100087.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/66557916601.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210911_7DF2E52CEBEC724C.pdfIn PDF document text
    • http://autodilygood.cz/files/file/98381905582.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/sukuvasuminilekuxabe.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/zemitepidulupovedamuwita.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_off0000c7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AC 10384 bytes
SHA-256: d14015d69d53dfdeeb20c92d15325da5c6c4783ce5a989f071d6832819d1ff5e
font_01_sfnt_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 18280 bytes
SHA-256: e84b466bc0ff1d7e4aa408adb90fba52bc5a99a412daaa185fbb6fc5841d0fc5

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