Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab588ed904016d36…

MALICIOUS

PDF

71.1 KB Created: 2021-09-30 10:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af8e2e1b2dfbbda71ced31861b8e4b91 SHA-1: e8dabb3e86ecd58459942a6433d3ec18de086a6c SHA-256: ab588ed904016d361304958d11db137d37df3aca8bb12bc77dbda28df3a2ff56
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links pointing to other PDFs, likely for SEO manipulation or to distribute further malware. The embedded URLs and the document's structure support this finding.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://abwplazaview.com/uploads/files/rexubakumidonuvusagev.pdf
    • https://wsbtitan.com/images/file/wobasi.pdf
    • http://flygarfield.net/userfiles/file/10247439.pdf
    • http://blccy.com/userfiles/files/47002763694.pdf
    • http://videotour24.com/data/fckupload/file/37633041324.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/3913c24c3b885b7457801306da68bd26/tuvobugerixumukadoropiw.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/60608825330.pdf
    • http://fongyoskert.hu/userfiles/files/90384930424.pdf
    • http://poaglasses.com/uploads/files/202109050349585512.pdf
    • http://russia-ex.com/images/blog/file/bazuzatilivulipulikep.pdf
    • http://azs-szermierka.pl/zdjecia/fck/file/jifirav.pdf
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/40872410111.pdf
    • https://chingchia.com/uploads/files/202109051513274529.pdf
    • http://webminmax.com/userfiles/file/79556655900.pdf
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/zazuzidalumas.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/95470351350.pdf
    • https://fleuriste79.fr/ckfinder/userfiles/files/32178443149.pdf
    • https://blnk.eu/userfiles/files/32981552158.pdf
    • http://immobilieninvestors.com/userfiles/file/bevisodogafej.pdf
    • http://pkynfe.net/userfiles/file/mugosuxazuxakamosu.pdf
    • http://damutech.kz/upload/2021/09files/210911132431425502glkr5.pdf
    • http://sanzmendia.com/userfiles/files/29595314932.pdf
    • http://evo-models.com/uploads/userfiles/files/kuwozin.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/b2ng9n0dde6krnu1v6npd3d6n5/3578463851.pdf
    • http://quincy.pl/ckfinder/userfiles/files/saxixujadapexuketaxova.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+notification+channel+sound
    • 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_off0000b335.bin
1d08e2cf075a89deb55ee481577f7ef55d5c96d3a27ab548c51f53607e788b93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB335 16840 bytes
font_01_sfnt_off0000ddff.bin
0b0c770e5390350887f3b44e6b2a29e40e013d6c8bd806661c05612650e013bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 10652 bytes
font_02_sfnt_off0000f656.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 16792 bytes

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