Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdab8b8f36cfdfa3…

MALICIOUS

PDF

76.0 KB Created: 2021-10-02 14:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f79848474486165e889537144fa1dceb SHA-1: 6af94bed0824a632f2380c819f6323a78569473b SHA-256: bdab8b8f36cfdfa344d39855e70867d7e31a73c05cbc2638ae68d8e7442c543c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially malicious content or phishing sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=self+care+thoughts PDF link annotation
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/70703825496.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/16187964532.pdfIn PDF document text
    • https://duel.pl/userfiles/file/feniliv.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rabarevalo.pdfIn PDF document text
    • http://koddous.com/userfiles/file/nabot.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/akrhlr2rb8imgtplp13aon0er6/puximu.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/pefubonavafonozuwizipu.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/38877517385.pdfIn PDF document text
    • https://harom.ro/files/file/23110533917.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/5260422497.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/nofaxadagobolakitoged.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/nirubuvazoxogavelawe.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/36812193779.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/dumimejifutilul.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/laxuz.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/79429287652.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/zajisexiwaga.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/55208142212.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/86413159411.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/81601078207.pdfIn PDF document text
    • http://slsnn.ru/content/file/44054220534.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/44256659079.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_off0000bf18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF18 20224 bytes
SHA-256: b6c429852fcba9eb525cea7104b57627f969c5b9942e51ee2273895c271c844c
font_01_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0A 10592 bytes
SHA-256: d4d1a2b0c87b5b73c84850f059e4a14bccc5cd93cab34a1abca0b95f098f40fa

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