Malicious PDF — malware analysis report

Static analysis result for SHA-256 2115de22a622bc5d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 12:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4450d36bbcb623606a3ffaa87f1c1811 SHA-1: cd77a47511f4a35efb97700d9ae523f10f3dddfc SHA-256: 2115de22a622bc5db5374dc97bfc897971ab6299d7dde487cd4107f649f41b68
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a tactic to obscure the true destination by using many redirectors.

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 https://oniceh.ru/uplcv?utm_term=temple+run+laptop+game
    • http://multi-accueil.fr/ressource/site-image/files/82618101011.pdf
    • http://jsdarvin.com/files/24990999484.pdf
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47014506276.pdf
    • http://aptekarynek.pl/zdjecia/fck/file/31158211587.pdf
    • http://german-ex.com/images/blog/file/wejatudosisowedat.pdf
    • https://drinkpoint.com/uploads/files/setomudokavelo.pdf
    • https://promaxsuspension.com/csmimage/file/jativarigazuw.pdf
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/20946453179.pdf
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/sovakiwavasozoboronuv.pdf
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/zifagekumisowudox.pdf
    • http://z-sinpro.com/upload/files/vovefoluxejab.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/db126ec6be5f46625744c2055fa410ba/rizegabaxir.pdf
    • http://amindoost.ir/images/upload/files/98476432279.pdf
    • http://impex-italia.it/userfiles/files/6467172853.pdf
    • http://handinks.com/ckfinder/images_store/files/masopu.pdf
    • http://pgp-puh.hr/fck_media/file/9900650076.pdf
    • http://werder-ritter.de/UserFiles/File/bugutejebabezubegekisi.pdf
    • https://turkeyinsurance.info/images/file/85446952545.pdf
    • https://maftplayer.net/calisma2/files/uploads/juduwusavutedajamuxa.pdf
    • http://jiin-torng.com/uploadfiles/20210912174645.pdf
    • http://elistaprezentow.pl/userfiles/file/56983085296.pdf
    • https://easternresources.net/ckfinder/userfiles/files/15148685750.pdf
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/povoraxuwebidojozogot.pdf
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nosufetepiremufowizudev.pdf
    • http://abnigakgdsg.friendship-match.com/upload/files/69036362670.pdf
    • http://brezov-gaj.si/uporabnik/file/87259384329.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_off0000df39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 16792 bytes
font_01_sfnt_off0000f750.bin
74464ef5ff9ee46e668c5e226c26ee9394a1ab7d5173d67d37c1d218c120f443		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 10400 bytes
font_02_sfnt_off00010ed0.bin
e7c609d1cb19a784a3da7b4c33cf8d8bb92a3989546c784df514a24a7867e1cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 17004 bytes

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