Malicious PDF — malware analysis report

Static analysis result for SHA-256 256cfa8e3f85e95b…

MALICIOUS

PDF

73.3 KB Created: 2021-09-08 23:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 531eb55e04c829dd27764d73f31ab68d SHA-1: 6e8f13caa51d50cf8996cc96e697f6f6b18e441e SHA-256: 256cfa8e3f85e95b79d2a825b2a1f3b0d638392099b23559b48ffd1191596076
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=download+dead+target+zombie
    • http://rebeccaosborne.com/uploads/89374353372.pdf
    • http://www.moyekolodin.com/files/19880904173.pdf
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/likafebi.pdf
    • http://szmchem.com/userfiles/file/57173543560.pdf
    • https://rh-h1tapi-turbo.com/contents/files/jevoxasopepulatofozora.pdf
    • https://middletonchambers.com/ckfinder/userfiles/files/28285995295.pdf
    • https://spotiverify.com/ci/userfiles/files/gawebov.pdf
    • http://uptownchantilly.com/uploads/files/26006779827.pdf
    • http://frigotechreina.com/userfiles/files/28757296462.pdf
    • http://autoachtercamper.nl/userfiles/file/sitimowumopufuxizufafofaj.pdf
    • https://cabsfromheathrow.com/userfiles/file/11902124981.pdf
    • https://www.ewdel.cz/ckfinder/userfiles/files/13075082805.pdf
    • http://atol-res.pl/uploads/file/wirarokujilijopu.pdf
    • http://interstyle.org/content/xuploadimages/file/dawanesenos.pdf
    • http://accronline.com/userfiles/file/6644678091.pdf
    • http://musicandyouapp.com/webupload/editorimg/files/disazakedenoxowizewaxalap.pdf
    • http://aweibel.com/Photo/file/nowuluxiwularadajep.pdf
    • http://www.heatandgas.com/EditorImages/file/36032804725.pdf
    • http://ngocphuocjsc.com/public/default/ckeditor/files/45592066345.pdf
    • http://salonorganica.ru/upload/files/5684992353.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/femafunenosofokizadupezep.pdf
    • https://fenixfalt.com/userfiles/file/82045544650.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbfd.bin
2a5d358ff200a2f19bc5fe7b323274b243c0d8f6a86e657c5c81e042d5f16ea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFD 16824 bytes
font_01_sfnt_off0000e78a.bin
2ef637927e68fbae249c54852bd104b6bdac551a3f37dc6295cb114f44e49f68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 10708 bytes
font_02_sfnt_off0000ffef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEF 16792 bytes

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