Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe2c9f9e6a1bb09f…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 22:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ddb2039774f977ec311fbb2b04f71eee SHA-1: 3361952d15edcd7b2fdddbd87657f0bbd3acf5ca SHA-256: fe2c9f9e6a1bb09f6d99e1c7df6e78d042cf6f4448a2072a5a43676e0dd9b371
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as phishing and a trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a probable phishing or malware distribution scheme. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://pixomot.ru/uplcv?utm_term=mr+queen+watch+online PDF link annotation
    • https://matraci.info/UserFiles/File/rubebowojanupijixezu.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/45598520898.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/guwudatuta.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/xevafaropesuxaza.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/tulelibimabefebejesobe.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/8999750960.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/2246029064.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210905_100542_137.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/31806700442.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/33005977988.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109080450053539.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/58150248647.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/504c552c16175b2b4b6124b41bda7859/nirexazan.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/motujupajan.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/xabefowagusime.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/fududoxevaluwedotivateja.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/68628905257.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/kuwuguzijuju.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e26059e05f45e3bbdb78a3fa1fbdbb76/27262286138.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/zuwitizosexapilexizunok.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/63782504884.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_off0000d76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76E 10484 bytes
SHA-256: bb4872ed7134c3dd1a76c17db8316fb9a7c12bf51e72c6ec74da16ac8a1494cf
font_01_sfnt_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 18180 bytes
SHA-256: a3d9090c7da460059d2cc5b9da743834f18865c0c31860a430ad122a8633bc5a
font_02_sfnt_off00011e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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