Malicious PDF — malware analysis report

Static analysis result for SHA-256 d643bffa4e4c6cc9…

MALICIOUS

PDF

83.4 KB Created: 2021-10-06 07:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e9abb0d13ac11ad82cdc74c361635cd8 SHA-1: 580c86dc60a7456a503908a30ea086dcb4384b9a SHA-256: d643bffa4e4c6cc95616ea16eb69e735a3a03db2184bb2d757cb89e8a9266616
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous embedded URLs, including one that appears to be a redirector, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content indicate it's designed to exploit users by directing them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=oven+baked+stuffed+whole+chicken+recipes PDF link annotation
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/15262940547.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/fifebiperegokijuvobeburar.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9dccf413---ruviwatujebip.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/seriwovusaze.pdfIn PDF document text
    • http://submission.jpvm.kr/pds/userfiles/files/noluw.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/34316861238.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/bulafenuxurewonu.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/16979384385.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/bitukujatovavuxalen.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/kapezupuxomeforitoragik.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/77931386362.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/jegiv.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/boxivikatejigatosev.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161517acf30edd---30371316894.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/zuwakametelikiwem.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/forumujidef.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/vapudeku.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/46978118547.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/nugugomok.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/50109996870.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_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 11228 bytes
SHA-256: ef1004e23074be326e5be4ed3c5aa9e3f20170b7d885af9fc4485621334d11c4
font_01_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 17560 bytes
SHA-256: 390e1d26850c0a52fc8cc423dc7ddc383f06a6d269079e535b0283a47b220a78
font_02_sfnt_off00012761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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