Malicious PDF — malware analysis report

Static analysis result for SHA-256 7682c2933e3dc15f…

MALICIOUS

PDF

70.2 KB Created: 2021-09-12 20:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9eaa73a89e74e8318ae256aef785801 SHA-1: 5c791e88174b0cfed3a444b135bdede63c0ad1a1 SHA-256: 7682c2933e3dc15f9ba28f3d86b865c2deeb6f029d9c2157ba09d9ac7479b38c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of multiple unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://sro52.ru/uploads/files/paziberabopuwebonatokus.pdf In PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/sosuxixewotaxitej.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/zovobijimagujipixejoba.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/21472005924.pdfIn PDF document text
    • http://ipceurope.com/assets/file/86136666491.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/24238020051.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/baxutopiba.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16138e86ea4c5d---metoxef.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/75204227181.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/31115351565.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/2491164489.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/1705610956.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/diretanejuwipagesaponu.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/90499513366.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/savarumononaxasefag.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/64886274768.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/99327844711.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/rupifadisojoj.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109061005009151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=all+social+video+downloader+appPDF 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_off0000b0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC900 16528 bytes
SHA-256: 5993e07df41bca34d7a18b8c01e1657cf63f5574f822baa454fd28a98bc778bb
font_02_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 10544 bytes
SHA-256: 5320c3fd7829e3428e2235729e29fd57d57155102d05d290d1f7e87f94c1e7b4

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