Malicious PDF — malware analysis report

Static analysis result for SHA-256 037ef254af2ea367…

MALICIOUS

PDF

77.0 KB Created: 2021-10-02 16:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 04bbba2d0a73a66b6041b72ad9c009c8 SHA-1: 807120ab4a7ddc329f278a1aa8c57555005a5591 SHA-256: 037ef254af2ea3676f3fb7c51f1cb8df46f48dc9a0d853ed954ec0cb0333fe8b
126 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous PDFs hosted on potentially compromised websites. The primary attack pattern involves luring users to these external links, which is consistent with phishing or malware distribution tactics.

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://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/98543157042.pdf In PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/3770965844.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/37240932513.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/vinizulagalubizexoxugimul.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/90336906984.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/16658535278.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/kekasolonenuwi.pdfIn PDF document text
    • http://aquatherm-graz.at/files/74384358959.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/77646743690.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/domipuwojuzoliporujeje.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/2052159818.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/luvelemulosisawel.pdfIn PDF document text
    • http://bazoolwddd.specialty-match.com/upload/files/90684545532.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/59621451485.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/84168421337.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/numosimereted.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/zofokalalu.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/11639852916.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/pikovixusodifetefodixik.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/93412034304.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/20149465784.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/safud.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/17695433653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=extract+jpg+from+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_off0000c2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B4 20176 bytes
SHA-256: 7a7da44d64961aa65218013e52edd7b61887bc8d7082f76b0b4fc55411a383e5
font_01_sfnt_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 10636 bytes
SHA-256: f35e0d2db6a78106e99c3ccb53b83c0c5c4b8b0648e9349edd70f3f5b59f8274

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