Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2c83e0dbb891a1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 16:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21c3ad936426de69ab2577fc240e749e SHA-1: 0d501f25d79a70fd138da2f2143d6eeea6f950d7 SHA-256: 6f2c83e0dbb891a1b337761fc54250651db4e711436f9f12a71a443877785d1a
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, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm, suggesting an attempt to redirect users to potentially harmful websites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings strongly indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ecohort.com/userfiles/files/vozeser.pdf In PDF document text
    • http://zenobiacultura.it/userfiles/file///55534971682.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/duxogurefominebureki.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/72167861663.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/futozumokaxavojul.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/mofozekudidabomuwasugos.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/vidozipawupojarixit.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/jelepozujifit.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/sovukaxinufevumi.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/xosedepofonusudofeju.pdfIn PDF document text
    • http://ropesadventure.com/d/files/97714645511.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/48002512127.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/vewimezoxemakenuwalip.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/10076605271.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/74283105119.pdfIn PDF document text
    • http://skene.es/userfiles/file/7549843708.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/23545366107.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/90546625910.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/83890840224.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613399b456179---56398140894.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kawivaravamukijeferelav.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/23102365647.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9ba3414f9---47030040452.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/goxipamozulop.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/74400940833.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/34752989057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mini+militia+original+gamePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 17884 bytes
SHA-256: 00ab5d4cde5ccde9e3534a2536f452005ebd848f230e3701dd389331b289780b
font_01_sfnt_off00010ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 10276 bytes
SHA-256: 82b90ab29a19d8a0dbcd123b39bc497ad9fe99ff94a1bde717f7143647aaad07
font_02_sfnt_off000123f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1