Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14106bc2d7f2b32…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 20:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 806d24c4b619f1526c061cadb1fc5f99 SHA-1: cb8a760171f57b803534018d020d53d6d2048633 SHA-256: a14106bc2d7f2b32f718ac1a50fb5cce3364b2cf7b2a95d12a41e8a48ac7a81b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external PDF files, many of which are likely malicious themselves. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, suggesting an attempt to distribute malware through a network of deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://wdnederland.nl/file/xopidinolab.pdf In PDF document text
    • http://ldkxzzs.com/images/userfiles/file/xelefababubefusipefojexu.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/97372708306.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/70800141813.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/54747187204.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/ladovawoluguwibuko.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1af9348a3---gakusawisego.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/jaxopinefowebuwiruxiwula.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/85021858492.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109150434058683.pdfIn PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/92404562672.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109011136047618.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/16372886394.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a82b2fb252b85147a706337e69cc165a/kavibafinefedisasilimijuf.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/3581282090.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/gegibesi.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/kuzivusarifetumife.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/zavemufaj.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/17034677663.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/vazilujojarubowavu.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/toratoriturulaga.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/14202486409.pdfIn PDF document text
    • http://riviera.az/userfiles/file/bopavu.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/wasutusib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=xapk+install+apkPDF 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://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_off0000b264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB264 9992 bytes
SHA-256: aaf66455dedc077b7aebac9eb0d679e4ce6c34c0a70571bc76b37217db8de8e4
font_01_sfnt_off0000c89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89B 16176 bytes
SHA-256: 043d0e803a9e763cd6e8ffe8a73cd3f585756bc98d5a0b3abf34ef2590e61f98
font_02_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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