Malicious PDF — malware analysis report

Static analysis result for SHA-256 066b50d1cb536693…

MALICIOUS

PDF

82.7 KB Created: 2021-09-23 01:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5723bcc5d206f40070da124d3052a089 SHA-1: 32446ab868a6a271eaaaab2a9fa33bd3ef3ae788 SHA-256: 066b50d1cb536693ebb327ae54dfce329eb3d34f40cc4dd90d56ed6a8e16fa2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to link farms on disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a large number of links on potentially compromised or low-reputation domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://irlanc.ru/uplcv?utm_term=download+payback+2+the+battle+sandbox+mod+apk PDF link annotation
    • http://kagoshimakojintaxi.com/userfiles/file/98084088087.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/ravituz.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/fawarifakewazosumofok.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/57892991582.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/16318474073.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/jupelemitoja.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021911130286226.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/wefodusizikidufexisusazi.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/kimipar.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/1923433536.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-9/20210909003704614042.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/18780053177.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/zorumu.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/35094686598.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/71663204537.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453f206f6c6---88025905417.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/46898236606.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/79678161945.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365edf5a291---sikunisujagove.pdfIn PDF document text
    • http://jump360.co/upload/files/20210913211829.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/7027456709.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/22421803720.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/80a1a6854c9a0ff864a9b959c7f3758b/90342652600.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/gadesediga.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/nutumaritaguguv.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_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 11240 bytes
SHA-256: c0f0600da046d6beb87de03345c44deb63f8a092b55d80ce7dd8cd3e590a1e58
font_01_sfnt_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 16964 bytes
SHA-256: 762d1825aeb0250f575d8fe5dfb25d66bf206f6d1b87a028276758fd2e39802a

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