Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da93a69fdde6330…

MALICIOUS

PDF

95.2 KB Created: 2021-09-11 16:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b9ed6a3c8425737b5e50a4efc978d40 SHA-1: 75e15afaa2710486b0196bbd2eb480bff04d7fee SHA-256: 0da93a69fdde6330363e1ecf270fbe9562e4d8cf12ea9d03d9d444715da6ec45
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL distribution suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://etre-belle.su/images/file/zaguwitejixizem.pdf
    • https://mimpishio1.com/contents/files/13410719242.pdf
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/salajabajepexapomemi.pdf
    • http://mrtowing.ca/Lawyers/userfiles/file/jowibapazedakonekim.pdf
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/72507797500.pdf
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/takuvopit.pdf
    • http://vipforiraq.com/userfiles/files/wuluseparejupojo.pdf
    • http://pm-ural.com/uploads/files/80748235467.pdf
    • http://adbrf.com/files/fckeditor/file/170745966161366275ccb8e.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/jemizoji.pdf
    • https://red-adlay.com/upload/files/negisugafifanevasutovudel.pdf
    • http://cherryontop.pl/upload/fotki/file/61942637877.pdf
    • https://spandoekland.nl/userfiles/file/12202574993.pdf
    • http://www.depomatrial.com/file/94045920348.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fc618a30ffaaf8265df741978136ff35/70664974876.pdf
    • http://atomiccm.com/userfiles/files/36385553921.pdf
    • https://perfecthospitals.org/FCKeditor/file/36412204434.pdf
    • http://snap-drone.com/userfiles/file/73061574431.pdf
    • http://suachuaspa.com/upload/images-content/files/64202350795.pdf
    • http://pastadimatteo.com/ckfinder/userfiles/files/85938778303.pdf
    • http://chromavials.com/d/files/sifelamusagutux.pdf
    • http://frickcontrols.com/uploads/files/88589794297.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=glucose+molecule+drawing
    • 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_off00010db0.bin
22846dad7be5ca5d0eedecb710f39262eff2366bb7803a44c90c38b319324c1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 10840 bytes
font_01_sfnt_off00012685.bin
fb760197d132193ae29ac282da2f49bcc7b3cbaec9caa520af4bc21bedbb71ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12685 18088 bytes
font_02_sfnt_off000155c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155C6 16792 bytes

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