Malicious PDF — malware analysis report

Static analysis result for SHA-256 b458afa9be971502…

MALICIOUS

PDF

69.7 KB Created: 2021-09-18 14:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3211b9432cbfdb1bf876b74d205f1d3d SHA-1: 851761f708be93fc0225226b200c642a362e6d88 SHA-256: b458afa9be97150260dc070b8ad3b0abfc2ed6e58c938ccc80c4e9a730f3d018
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many unknown URLs suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://myparrotfood.com/user_files/files/80533958193.pdf In PDF document text
    • http://icaalliance.org/filespath/files/20210917210433.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/dukufisakelubu.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/19775172713.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/54838904771.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/39416098142.pdfIn PDF document text
    • http://chapelguild.com/images/usr/76624710653.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/76966968648.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/55305445664.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/vanetam.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459c6fe7fe3---48896604611.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/17330225323.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/lbla7sfvutdlkd7rvehoimr8t7/diwukarikadokuzadavagobol.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/sevoxorujekuxoli.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/tedulexusojujejowawuto.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///ketaverim.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/meremuv.pdfIn PDF document text
    • http://rafaelokazakov.com/file/59074244288.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/18653796231.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/zafaduxokisibudunulami.pdfIn PDF document text
    • http://chinalabware.es/d/files/77107070844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=undelete+for+androidPDF 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_off0000b056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86D 10184 bytes
SHA-256: 53d56fd75e02c41f3d4f34836f4e859e582c9036e9d097b7c668127b6b4f6308
font_02_sfnt_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 16688 bytes
SHA-256: 639ba314cf81aceb025fc4dc807294caaa78111bb8b1c4f233605bacd4323898

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