Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ebc0299c07a34a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 20:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 226e89679b1e32b0b757f762f17bc5f3 SHA-1: 906ab58ea36c40c2ef6027fcba224116a8aa01e8 SHA-256: b4ebc0299c07a34a38b9fad4a5575cd1bdee9c7b244134593d3f9a86c6e43819
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs that point to a link farm, a common technique for SEO manipulation or distributing malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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=simple+story+books+in+english+pdf PDF link annotation
    • https://moiatakashta.com/userfiles/file/nafubezaremi.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/11928409054.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/nixozipomefudad.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/52151000650.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/dutitipemewuwalomu.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/82987396639.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/32347440149.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/94977025234.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/tepewolerowesuvamenusa.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/nomubovavitewojujetomi.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/gexudimujejepuvasup.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/tikivarekel.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/64397219939.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/xawawoborakaleliko.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/ximibabonata.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134220686a17---99387377087.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/97430250011.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/depopuvip.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c66862a2ca---40333461679.pdfIn PDF document text
    • http://actinq.nl/upload/file/94208825641.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/35792266615.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/69298873655.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/82626657821.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_off0000b1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AF 11204 bytes
SHA-256: 8531a24020128064f16b068cce45bf6cf14150283fa87ab4f323cc35df245fb3
font_01_sfnt_off0000cb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3A 16256 bytes
SHA-256: 32e48619be9f500c3a73f5b9dc8554c8c12c4b03bdafc5810d47f7c127626ba8
font_02_sfnt_off0000f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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