Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa7f10e4cf7a623…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 10:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f4154f88c12e947ade2a176f9330e65 SHA-1: 589e68c615af7c81a4794a23f5b2daf8ba5cb3af SHA-256: efa7f10e4cf7a623cba67ec9add172b969cd93b25e69f491eeef344c09341b9d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying a pattern of using disposable hosting for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=how+to+edit+pdf+that+is+locked PDF link annotation
    • https://proetcontra.hu/userfiles/file/sofefakebufe.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/36399273426.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/76749499217.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109161007348759.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/bikovidolu.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/pezaterafuzomebuwe.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/86408017375.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/zizuzupotome.pdfIn PDF document text
    • https://redac.ch/upload/pisika.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/vuwamigapaxituj.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/75527222321.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219132218423242.pdfIn PDF document text
    • http://mosjob.ru/images/file/zerekenujutef.pdfIn PDF document text
    • http://huefpdf.org/upload/file/7277618883.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/xesotusinuvawifudobilu.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/porenu.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/30561173304.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/jefoxoni.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/niwizip.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/supatogerevopi.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/42396963291.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9aeb77510---bonunisilolozidunet.pdfIn PDF document text
    • 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_off0000dc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 10680 bytes
SHA-256: 4d1815d7c5c1a40350558822de7ae1210c0352dace325317a6104361a84f8079
font_02_sfnt_off00010d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 17928 bytes
SHA-256: 4b8ea3b370dda88d228e304653433b437ac5de0caeee0cbfc0d1d130b8f2dcfb

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