Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a128586cf79f8f…

MALICIOUS

PDF

89.6 KB Created: 2021-09-11 23:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3959a579171afc28b17c15bc52e9b1a8 SHA-1: f4ef0b2703dd8a127a9f5edc4a8d96d0d3ef4b78 SHA-256: 96a128586cf79f8f1e3ef52aa421345c78fdcbc72e661f04009ef175879770ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the document as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://laborke.ru/uplcv?utm_term=midsommar+full+movie+123movies
    • http://harnettcountyhba.com/userfiles/file/borukeranujoxosebig.pdf
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/bafobefipivu.pdf
    • https://bawwabatrizq.com/userfiles/file/20335076725.pdf
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/22486185607.pdf
    • https://nezrenweb.com/calisma2/files/uploads/89556877220.pdf
    • http://italy-ex.com/images/blog/file/48701014680.pdf
    • https://kildevangen.dk/files/49450898938.pdf
    • http://lingeriedediva.com/UploadFile/file/2021090903272573499.pdf
    • http://partnerplus30.ru/images/fornews/files/puvatutilozevizeg.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea62766d87---watetolusibifodiwevuk.pdf
    • http://tischtennis-kiel.de/images/file/65104511473.pdf
    • http://safarang.com/basefile/files/43109612273.pdf
    • https://etravelbox.com/scgtest/team-explore/uploads/files/25938692532.pdf
    • http://mweb.cz/images/file/mizerivipadejesojalu.pdf
    • https://martensmgt.com/business_school/uploads/file/besugeloxowujivekodepi.pdf
    • http://aisne.proximeo.com/ckfinder/userfiles/files/jofepofowiwidalavowufo.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/12a06998d9ef7f59a502edb7724e1963/64787895886.pdf
    • http://studiopedrazzini.eu/userfiles/files/15166641259.pdf
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23325836572.pdf
    • http://showplus.ae/userfiles/files/1851782055.pdf
    • http://umrllc.com/userfiles/files/2064614564.pdf
    • https://hiperaktivite.info/userfiles/files/86695335296.pdf
    • https://biocoils.com/img/file/49833488703.pdf
    • http://konsultacjenaukowe.eu/Upload/file/metamezexidugad.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/68043070581.pdf
    • http://wx-test.com/upload/ckimg/files/202109070927016542.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_off0000f5c0.bin
d1302c9fd5bc355674beea1232c5fc96edeba16b753a64419780ae1e0466aefa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 18944 bytes
font_01_sfnt_off00012745.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12745 16792 bytes
font_02_sfnt_off00013f5c.bin
1bb6365eb7f950b0a335afa747b14622b1b03789b428b61f08052f8375d7ccec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5C 10816 bytes

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