Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bde342f4b8a9dc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 23:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4eaa7163f930c83a99203bac77a5376 SHA-1: 03dbdc34fe99e3f72999c22dd7e86710bb467956 SHA-256: 36bde342f4b8a9dca15e6aa31bdab312feee24675a7ebf14ff246fe5da768150
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to redirect users to a collection of other PDFs hosted on disposable domains, suggesting a link farm or SEO poisoning attack. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://tubesealer.com/uploaded/file/9132852166137d0f5abe7c.pdf In PDF document text
    • http://benevolo.it/userfiles/files/nimomeren.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/modajerogu.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/48532888858.pdfIn PDF document text
    • https://penal-garazh.ru/files/47055034153.pdfIn PDF document text
    • http://i-dron.cz/data/file/26235538617.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/zomumeguxudufazafarosolep.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/58170898846.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/37023499814.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e82a64f84---zopoletovazamilosivofu.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/sodudezimabibomuwa.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/42642371984.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631537162.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/lusubanugudibifozij.pdfIn PDF document text
    • http://lawngo.net/fckfiles/wapuxepututuxusegesop.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/zazalikuvogeguj.pdfIn PDF document text
    • https://baglab.pl/galeria/file/45114826150.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/49091916939.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/62037664224.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139df2650704---24993318699.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/6113173393.pdfIn PDF document text
    • http://belean.pl/userfiles/file/xumexebanovobebadafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+android+cloud+music+playerPDF link annotation
    • 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_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 17724 bytes
SHA-256: e38575e4e483bcc6a8df415e37b0ea62bbbe93c23e897d72fca9466cca9cd58b
font_01_sfnt_off00010832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10832 10944 bytes
SHA-256: 4f701677798838530a10fab61c29405963892d535f5f18a1368d67c6dbca1a18
font_02_sfnt_off0001219a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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