Malicious PDF — malware analysis report

Static analysis result for SHA-256 3985fd591b4a7b07…

MALICIOUS

PDF

86.1 KB Created: 2021-09-13 08:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a0716a5fda8f28f9b69063bc3c848de SHA-1: b130dffac8194d7417cfd09fef9cad9356409ec7 SHA-256: 3985fd591b4a7b07862ba824a5428406f1ecfbaf6af02e528295317e8d790410
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. 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 exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=minecraft+dungeons+unblocked
    • https://artcorner-fiberglass.com/userfiles/files/80392675534.pdf
    • http://gibkrakow.pl/uploads/files/63429487204.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7cb2deca---95447187093.pdf
    • https://quatden.vn/webroot/img/files/rexude.pdf
    • https://ptkas.com/kingkong/userfiles/files/22244162119.pdf
    • http://hidramaco.com/files/files/47138782118.pdf
    • https://drlanda.hu/user/file/rejigubi.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/gewajuz.pdf
    • https://vidaleve.net/ckfinder/userfiles/files/12597299802.pdf
    • http://ballmillfactory.com/d/files/jator.pdf
    • https://indiachristian.org/uploads/files/pezale.pdf
    • https://unosms.us/userfiles/file/17219944597.pdf
    • http://goksirlambinowice.pl/img/upload/files/liroxikiruzujixum.pdf
    • http://co-wemart.com/careeruserfiles/file/gobiri.pdf
    • http://mextro.de/upload/files/zepawegiwuduju.pdf
    • http://jiab.net/userData/board/file/77941820961.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/98405352935.pdf
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/vutogolupizegi.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161377947e388b---92917863911.pdf
    • http://kfnmsz.com/upfolder/e/files/20210904015735.pdf
    • http://citygclub.com/ckupload/files/jexivubazixaw.pdf
    • http://everbeenmagnet.com/js/upfiles/files/84790306473.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_off0000ea9f.bin
740f042a1a617ffd939cc701cba2819db6e452239b34a0886d486ab88444d4b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 17880 bytes
font_01_sfnt_off0001193a.bin
f49fb3b00bf44d7661402fcd9694c13509b155f9e581a24a7f57700f9f12e532		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1193A 10976 bytes
font_02_sfnt_off000132a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132A4 16792 bytes

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