Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c1948fd785b7b8…

MALICIOUS

PDF

67.5 KB Created: 2021-09-30 23:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9fb6a8bd851b42bc200270aac7a74727 SHA-1: 1684ef3a3313e4d41dfa720e2496b7ceacaebde3 SHA-256: c0c1948fd785b7b836233c6c2f3df0a26b170e9600a65bdb2fc518a01427820f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, being image-heavy with a clickable action trigger. It contains numerous external URIs hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing malware or conducting phishing attacks via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=amulet+book+7+pdf PDF link annotation
    • http://lncxjzxxw.com/upload_fck/file/2021-9-30/20210930234601642552.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/77963660140.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/powipunelonuxifuvo.pdfIn PDF document text
    • http://dalaichau.com/files/24099084983.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/kezelujeturofejizetumaka.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/nusobiba.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/27402688440.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/88900133067.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16155b2d86bbf8---12189050194.pdfIn PDF document text
    • http://matras-devison.com/upload/file/4892050697.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/23448271240.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/79096826945.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/37324923496.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109050904053753.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/nuwenudeje.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109231050582728.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/nakoti.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/jumel.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/64400135993.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/70515990623.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457a2cccf08---mixomewosorugizagimat.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/biwotur.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/30129209475.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/49519809298.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_off0000ae1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62C 14072 bytes
SHA-256: 52a9c7abb8dc01e551904daf2bdf19f51b736c0466ac7a415ee91d425377ac80
font_02_sfnt_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 10396 bytes
SHA-256: 53f7fcb758158610135ad4ee47607600b5093805449a4d96f61f6a3e116da3c6