Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cde7eabe06de395…

MALICIOUS

PDF

69.6 KB Created: 2021-09-15 00:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 799f502fb7ef28897e4cd6c7079db6b1 SHA-1: bd2de8aa07c7ecd50550815d226538f60b10facf SHA-256: 0cde7eabe06de39510727786f008369d7624171cd4dc970abd8a353b03c68339
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm. The primary purpose seems to be directing users to download potentially malicious files disguised as legitimate software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=logo+quiz+game+download+for+android PDF link annotation
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/24071172561.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/98928651084.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/53793140859.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161410f2fe4144---vilemumerivipovojodu.pdfIn PDF document text
    • https://tierlistei.ch/downloads/repisenuli.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/80525830187.pdfIn PDF document text
    • http://orenprom.com/img/account/file/zitazubakuxure.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/6907941459.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/65674558130.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/govefuvunonumevuledorogup.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/tadeg.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/kizanurawinofabibuloder.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/nasuza.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/36679188252.pdfIn PDF document text
    • https://bdata.vn/upload/files/xupedilozegakadusiwugosoz.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/worerorisev.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/sejitarufuzazusenavux.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/pilodadaganu.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/gejatobalire.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/rikuvesivelofomonef.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/64408307784.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/kupirirubokuxaval.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/70880365623.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_off0000b24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24E 15028 bytes
SHA-256: 4f631b9a5cbc3cc638984dcf26591759709c8c30234ba0c014f37bb62728414a
font_01_sfnt_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 10780 bytes
SHA-256: 0bcb471037c5b63bd7046d0e1b97e369785d3b853f08abb7a634f4ed638975be

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