Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c24a12d7b745b03…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 01:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c61b92da3c4b7aa36dbb18261dd1ae19 SHA-1: 94e1b39c7b83373b0782b6f5f19252d9a2ffb6e5 SHA-256: 8c24a12d7b745b03a46e87fecaf2b31e1d91cef4c4f344781189e1032e2084d4
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs, many of which are on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to obfuscate the links or perform malicious actions upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=pes+2021+android PDF link annotation
    • http://www.naturhalles.fr/fckeditor/userfiles/file/xodugaki.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/wivefopunofewixulofapez.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/mitenev.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/66085441176.pdfIn PDF document text
    • https://cf2019.codefon.hu/js/ckfinder/userfiles/files/32239171423.pdfIn PDF document text
    • http://tochuchoinghi.org/files/54728170677.pdfIn PDF document text
    • http://z500.si/files/vowejule.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dae61d7c42---68619396354.pdfIn PDF document text
    • https://spyboarcams.com/files/zekurilex.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/2460678676.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/81422053739.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/gejefuvum.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/segepuvi.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/45065237226.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b562804a6---31339416165.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/46144141020.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/55898717177.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/kajimarubiziku.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/74021711622.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/lanepave.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/57327107088.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/gigarubomaravaguj.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/80416840237.pdfIn PDF document text
    • http://plise.org/userfiles/file/14961319160.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/ragefofifomu.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_off0000b390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA2 16604 bytes
SHA-256: 8e66a704ea32685406beff600468423743af36b38d1f1f16246a9eb256fb7488
font_02_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 10392 bytes
SHA-256: 29db6ecedca738533b355732428a07c58c88f415c9ff28b6bdbbcf90819b45c8