Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a968b3d24f77532…

MALICIOUS

PDF

83.1 KB Created: 2021-09-21 21:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b8e5b03d16718d6e06900a9fe494683 SHA-1: b150bc22110b8eb4b215e367355e17b83d3f91c3 SHA-256: 0a968b3d24f77532fb2dd578aa94eccdaae17e9d72f7f90c37a98511b213e9fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded URLs, many of which point to disposable hosting or are part of a link farm, indicating a strong intent to redirect users to potentially harmful sites. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crysiq.ru/uplcv?utm_term=adobe+photoshop+2020+crack+mac PDF link annotation
    • https://hk-delight.com/UploadFiles/file/raxodojogekaduji.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/bopuxaximadelarexape.pdfIn PDF document text
    • https://sharenkon.com/files/77646343157.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/desabagumijusilivifo.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/papokenajatenajakudu.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/j8k7ipjn8eodctvm8g7d79nc5p/samezavowa.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/fexegi.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202196919597653.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/52122479824.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/dajidadaseve.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/94819170246.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/vibewubu.pdfIn PDF document text
    • http://abc-tel.ru/data/File/mosofusefefedagujuxadet.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/gowipotamozanasodo.pdfIn PDF document text
    • http://cityfate.com/files/files/tesepamorixaxugaf.pdfIn PDF document text
    • http://telecycling.org/files/file/toxeketiluxor.pdfIn PDF document text
    • http://eventechsite.com/files/files/97401225950.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/pimemoxapod.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/bisewelezukimajovup.pdfIn PDF document text
    • https://lerivagedesmilleetangs.com/caningest/images/file/76905639444.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_off0000db19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 10992 bytes
SHA-256: e76b7065f5c92fae7394d118c520a2df219d7040b6ae9ec5f597312174e49580
font_01_sfnt_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9A 18828 bytes
SHA-256: 98fcdcdeaaf68cefcd89593cfb79845a55fb98a6790c0513f60384fca555f18c

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