Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ce0d14cd06f3ef…

MALICIOUS

PDF

75.3 KB Created: 2021-09-19 14:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: affaab0623bc816eb56dd8bc6e4b1b40 SHA-1: 0e31d7bd643f5db0e5206eb02ca96f316aa568e5 SHA-256: 41ce0d14cd06f3ef79787bb1674c04245482d65f619c26fa81bf32a60e505313
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one specifically identified as part of a link farm designed to redirect users, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=compare+and+contrast+prokaryotes+and+eukaryotes PDF link annotation
    • http://studionegro.net/userfiles/files/30948765316.pdfIn PDF document text
    • https://bawauang.com/contents/files/54712848946.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/66649336423.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/nojopube.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/31140146259.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/41501171530.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/13318029664.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/77955446191.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/51232389592.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rovafakejarugepudopi.pdfIn PDF document text
    • https://intersat.lv/files/file/melesemobuvinulujukirixig.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/7f65a9a5a873b2b61999e74c74dae35a/sizale.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/dunazixaxotobeperoderof.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/zekoxusuzikedolag.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/14797135206.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614544edd5449---zinifapumuxuwusifar.pdfIn PDF document text
    • http://kahasat.cz/data/file/vowuzumavemulurosodago.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/zodikowogap.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/fazagibiresewapuvuva.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/239118946.pdfIn PDF document text
    • https://cargotavio.ru/files/file/piwazena.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/rulogigezevodo.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/boxebiluzavuzipod.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/28675038125.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_off0000c335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC335 16640 bytes
SHA-256: 0cde17d7f6fad412432c960e997a4e1b3c14b88203fae0e8db205c40616c1202
font_01_sfnt_off0000ede1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 10872 bytes
SHA-256: 8029c613945818b0adc9465edfce54d7e6706dd29da522c40ef90cdf7d0ec152

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