Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e0fc5aa27429c6…

MALICIOUS

PDF

78.9 KB Created: 2021-09-27 20:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f84eb25bc2bf8e1127c3b5a92b8669cb SHA-1: d6ade7d1db7b35de99d7c12f586ea9385085fde3 SHA-256: 84e0fc5aa27429c693f1b10d95270904e5090ca2de08cdc3b26a83cde72a1414
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

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://infrive.ru/uplcv?utm_term=android+tv+chrome+apk
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/givopuzulowuj.pdf
    • https://livermore.com/wysiwygfiles/file/mizijamimuzomorefoxorul.pdf
    • https://geneticapanama.com/userfiles/file/32291844167.pdf
    • https://rjpexport.com/files/goluzikerimazezafup.pdf
    • https://chp-travel.ir/data/file/91426926995.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/gekuvamarul.pdf
    • http://korytnica.net/data/files/24463835259.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4590bee61---60991374110.pdf
    • http://webinaris.eu/ckfinder/userfiles/publics/files/39562958804.pdf
    • http://udmvdpo.ru/images/files/pinenulekadonunovi.pdf
    • https://bahispesinde.com/gnc/veri/_files/xoxizemomenarako.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/54425856698.pdf
    • http://chokmanee.com/userfiles/file/41557848822.pdf
    • http://carsonpokebar.com/uploads/files/85767969356.pdf
    • https://transdeliveris.lt/userfiles/file/zivuwipexumij.pdf
    • http://architettoangeli.it/userfiles/files/folemojuzexudelavimef.pdf
    • http://rockycheng.com/ckfinder/userfiles/files/vabezepogotetadoku.pdf
    • https://vinniescustoms.com/userfiles/files/bunixivijameteperosib.pdf
    • https://architektor.ru/uploads/file/bimivofe.pdf
    • https://silatur.com/js/ckfinder/userfiles/files/50586367288.pdf
    • https://spa-salon.ru/ckfinder/userfiles/files/50862784368.pdf
    • http://appartenvue.net/appart/upload/images/luniniwipuzereluxuso.pdf
    • https://laplacedesstores.com/upload/file/11344972529.pdf
    • http://street.bpv.su/content/files/files/22450542118.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7fb.bin
28b29b78cc66516e935b7c7553645c7bd906f3da9864b5d8b898a26a197c0352		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FB 20472 bytes
font_01_sfnt_off0000fd3a.bin
588968080ea9e9b9f1e81a53688e48b91aec965d1fe91804a5b8c3f2295817aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 10704 bytes
font_02_sfnt_off000115a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115A0 16792 bytes

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