Malicious PDF — malware analysis report

Static analysis result for SHA-256 8748c4b178a6de31…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 01:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90e7ba34c44abd9c044a6aea75340f5d SHA-1: dc24cbf7f730b58073f4353e09bf9d515d6b266e SHA-256: 8748c4b178a6de31941fb45b58244e29db8c26aa1653b2cb5a4bb2d0bb0c0d19
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to suspicious domains, and one heuristic specifically flagged it as a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a phishing/trojan suggests it's intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://volareinmongolfiera.it/userfiles/files/sezalenepinivozusarurot.pdf
    • http://gs-metals.com/filespath/files/20210909162844.pdf
    • https://tradegateindia.com/userfiles/file/vegoravurubejove.pdf
    • http://apple888.vn/luutru/files/19393391231.pdf
    • https://danfort.lv/userfiles/file/91631097184.pdf
    • http://midesignvn.com/uploads/files/nasesixakagukologijukuni.pdf
    • http://bakersfield.thepokeluau.com/uploads/files/fukijowesekulinogoxasaj.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/28129261609.pdf
    • http://banglenhospital.com/UserFiles/File/venexusuzuzaxozudupap.pdf
    • http://mycoapaisyl.com/webimages/files/tudapenepa.pdf
    • https://gfwofficial.com/ck_imgs/files/nowufi.pdf
    • http://hcbarrett.com/user_area/file/66588708286.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/mowotukeboruzafazurirabam.pdf
    • http://timandlor.com/userfiles/file/7484124338.pdf
    • http://paneldeconsos.com/userfiles/file/bapawig.pdf
    • https://partetesal.ir/data/file/74094829520.pdf
    • http://xmzhj.com/UserFiles/file/bomukegoxevopugobudo.pdf
    • http://www.cafeinca.com/img/public/contenido/file/41885896118.pdf
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/vulakajanunijuv.pdf
    • http://goldmustang.ru/files/files/7478733750.pdf
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/zudavixarudetodukamu.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eca555141---59647302417.pdf
    • http://biznesfishki.ru/files/userfiles/files/44265807043.pdf
    • https://venus-forever.com/image/files/pavoludiveneruvi.pdf
    • https://hbphoto.ca/resimler/files/fumijopekekiniwezef.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137267c68407---39602846157.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=my+mobile+hotspot+is+not+showing+in+laptop
    • 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_off0000da41.bin
2814e92677b0c14a4e71ac3f98335dadf8e06a1c99f9aeaa8e14a6b85b65d951		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 18016 bytes
font_01_sfnt_off000108f8.bin
64b9d78930e0bab388fbe1582fa20478d0e56127c7153685828be5360ab4929b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 10932 bytes
font_02_sfnt_off000121fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 16792 bytes

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