Malicious PDF — malware analysis report

Static analysis result for SHA-256 3983722dba583d8e…

MALICIOUS

PDF

74.1 KB Created: 2021-09-18 15:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cf76596c5d0800448ceb3ca8b58fc29 SHA-1: 0a7ffa15681f3600619e3f4044d90b9326b7c80f SHA-256: 3983722dba583d8e071f51f9e790d9ce0204416a2efbda2dc48e3ec622540c02
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The primary URI, 'https://philabc.ru/uplcv?utm_term=tekken+7+free+for+android', suggests a lure related to game downloads. The embedded JavaScript likely facilitates the redirection to these malicious sites, aiming to trick users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://philabc.ru/uplcv?utm_term=tekken+7+free+for+android
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/guzemetuz.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/69886531440.pdf
    • http://mebizstekla.ru/userfiles/file/5993623115.pdf
    • https://www.paseppe.gr/ckfinder/userfiles/files/gakikilovujef.pdf
    • http://joyerialaplaza.com/ckfinder/userfiles/files/pedarupibitejufafelof.pdf
    • http://abbwingslynnhaven.com/uploads/files/sinewesibaxam.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/84671718007.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a0c54febad5d6238e790789466af4946/kobupeboruxilogo.pdf
    • http://locthanhwindow.com/img_duhoc/files/20217586437.pdf
    • http://prinsart.ro/uploads/files/12296455457.pdf
    • https://gotoko.com/cmsv2/upload/files/5110902591.pdf
    • http://fygl.net/uploads/file/041433204205.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/siserewujelotomolelib.pdf
    • http://terremeraude.com/userfiles/file/71019134756.pdf
    • https://rireenfrance.com/images/upload/files/85175008754.pdf
    • https://ferropula.hr/files/46389340534.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7a7b2bad15e9e9a5140710e18575c7a1/27121985617.pdf
    • https://helicopterleasingservices.com/userfiles/files/86638876785.pdf
    • http://rld-carbon.ru/file/jexadujozafigojavit.pdf
    • https://keyword-lda.pt/site/upload/file/40343582589.pdf
    • https://simbotour.ro/ckfinder/userfiles/files/47473023374.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_off0000bdf4.bin
50c38d4a764e762d96e2e71cea880d7e0599e7d3621f59e16a5bdd6e01fc7435		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF4 10140 bytes
font_01_sfnt_off0000d4bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BD 16792 bytes
font_02_sfnt_off0000eccf.bin
6c106deb4b491d3ab252b6f682cd7bdbad0873f430966c61bee4ba94e4d99e67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 17960 bytes

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