Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c75ad5b2a72930…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 01:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c1796119df270f84ceac272f37df324d SHA-1: af0ecc9abd07c365e814f89f832e10314a06bd99 SHA-256: e6c75ad5b2a7293086513b9429f5f9de312fc028a2a4bfb27e13d7efafaabfd9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=totok+ios+apk PDF link annotation
    • http://splogservice.ru/content/file/mured.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/kewilijab.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/37851958774.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/rukefuketule.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/73670032516.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140717642a20---vifivunefiduko.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/jonebovojarorug.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/tekukukava.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/xadabimojatovegexej.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/bazizudijiza.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/75374167020.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/pafegejezefixam.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/28797998474.pdfIn PDF document text
    • https://fond.ru/userfiles/file/69961834793.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/nuruxanupek.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/levuw.pdfIn PDF document text
    • http://rs-entp.com/upload/file/18776664683.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/31897467349.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/6921767728.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d2c3d94afe0f6711072273be819a728f/gaxudovetukobep.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/61436550975.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/sepagomovurezulezitidiw.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/41978892503.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_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 9920 bytes
SHA-256: 93ebe1cf539b24b1ed98e6682464d2866b16a7148aa3af0b4299853fadfe71a7
font_02_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 19312 bytes
SHA-256: 703b3b68f597cc9ac0ab8d5b0097caa0c65b000dd0c7d227ca06ce608b555b45

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