Malicious PDF — malware analysis report

Static analysis result for SHA-256 803d7468787c9d68…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 05:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cd86ee8c3f56b0af8434d53211c1991 SHA-1: 63027630475b4e7d8837e4cc5efc5714c1f4b6ce SHA-256: 803d7468787c9d68a319c626e709429007f533ef61de1d8d34873db91a9a0b58
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are part of a link farm. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document's intent is to trick the user into downloading a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://saraiaser.nl/userfiles/file/likopak.pdf
    • https://www.sophrologue-nimes.fr/upload/news/files/92451769825.pdf
    • https://creativitagh.com/pevron/www/img/file/19254914644.pdf
    • http://sungsam.net/userData/board/file/66807816745.pdf
    • http://yavuzselimvakfi.org/resimler/site/files/dezagogoko.pdf
    • http://mygiftltd.com/userfiles/file/98841565912.pdf
    • http://6nergy.fr/6nergy/sites/default/user/file/sofowidejezomujiperopo.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/8571937397.pdf
    • http://hacoauto.vn/upload/files/dojititobuburegovuzesur.pdf
    • http://www.farmaciabergua.com/userfiles/files/zukemus.pdf
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/wotivaninixafaxukuwu.pdf
    • http://melly-incendie.fr/img_db/rabidarubor.pdf
    • http://stepasidemedical.ie/images/uploads/file/setegewavakutinazup.pdf
    • https://sowlindia.com/userfiles/file/50738527658.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4cf8cd6c27b8e988a90cc79300101e7b/xenutanakaf.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453eb09e2fa---pinegedojesun.pdf
    • https://ximangcampha.vn/upload/files/18908855460.pdf
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/49735722561.pdf
    • http://encino.ilovepokebar.com/uploads/files/82215841155.pdf
    • https://ruh-center.ru/userfiles/file/dujekudojak.pdf
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/wugamafutem.pdf
    • http://hitechdentalhouston.com/uploads/files/baxiwuj.pdf
    • http://pnalog.ru/images/file/xujur.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=es+file+explorer+file
    • 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_off0000dcf1.bin
d5c79d8600147b8fb22cd22e095a9a303bc9fd5c6183654737638e7246e4c11d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 19156 bytes
font_01_sfnt_off00010fa1.bin
21dbceb6a91bdceed680c779098df75816c12d06746bf8dbeaba9d7f5d6763e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA1 10072 bytes
font_02_sfnt_off00012624.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12624 16792 bytes

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