Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2921daa4361a278…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 10:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 51c457918b09c7bb2b5b6b31dcd8913a SHA-1: 59a0b9f407ed731e72f5970f41b46ca00b95e9e0 SHA-256: b2921daa4361a278ce0d7a485dced83e2acf107b68a62c9191d39f744a08cb14
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs, while many are unknown, point towards this link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://longruiglass.com/ckfinder/userfiles/files/20210912_140240.pdf In PDF document text
    • http://ballmillfactory.com/d/files/sikimilubasemewutib.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/20653318607.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/6312019418.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/56639309490.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/26117227183.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/mipunup.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/beposuguzeja.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/17527966338.pdfIn PDF document text
    • https://planbmedia.hu/files/40222437007.pdfIn PDF document text
    • https://buka.ru/sadm_files/dokizabarosigufas.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/bobiruzusag.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/92902141880.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/31142665119.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/32314030397.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1615564021b0a8---28717055192.pdfIn PDF document text
    • http://sbkf.org/files/files/55160337016.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/rutemumuvusatomumudebuw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374e3e7240b---tepuwepowikusipivisumo.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/78365997174.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109180542284498.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/fogosaranime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=integration+derivative+formula+sheetPDF 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_off0000ade8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE8 16904 bytes
SHA-256: 533488ce2745fea8fe3d64474d22fdc8ef194b99617a80d52531fc8628566591
font_01_sfnt_off0000d987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 10916 bytes
SHA-256: ea833167f48d6d26b338e7c5a3a41d63d9da2077003cb165deb29d2a5e92f95b

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