Malicious PDF — malware analysis report

Static analysis result for SHA-256 4276b2b4c5024c08…

MALICIOUS

PDF

88.1 KB Created: 2021-09-19 14:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba3dbf99d2eeea40dfc458baba0b5712 SHA-1: fd32ca5bb0a251d1ecafd24c0ffaf3cd84330766 SHA-256: 4276b2b4c5024c080411a9cb353a743bfc8207ca5d3d942ca6c079ad7a2e9a26
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, including a link farm on disposable hosting, suggests this PDF is designed to redirect users to malicious sites or download further payloads. The primary attack pattern appears to be phishing or malware distribution, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=best+joystick+games+for+android PDF link annotation
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457617e80c3---65121225290.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/36778959921.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/nilinivixigubum.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/49085128387.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613E30AEA3456.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/figerekesagitiwuwix.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/83802837593.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/dajunixutotivimid.pdfIn PDF document text
    • https://timminsrenovations.ca/file/GV4ujA9qZ4v0iuza.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/31060036236.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/ponakamevasigulutek.pdfIn PDF document text
    • http://liily.jp/upload/file/20210909091123.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/40555638597.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/kirenosugo.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/10325761395.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/8509757755.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/mituweboje.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/46077391003.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132798b9bc2b---40933343143.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210905052008.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/40549778318.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/kixivipijajiroju.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/71497449575.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_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 11160 bytes
SHA-256: cd4d30b6b0fadd28dd05e0e68956e914c785230494cf153c725c73f60f00af57
font_01_sfnt_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 17184 bytes
SHA-256: 45f196a8c0509ea4ea530c2578209db27e3502290a84603c14f0cf3ca7c4c513
font_02_sfnt_off00013a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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