Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c4b3b15f40b5d9…

MALICIOUS

PDF

75.8 KB Created: 2021-09-09 23:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a35bc571f8361cddbc3a7c5f3f72a8a7 SHA-1: 36bcb2ea8ba6258dc7b9a24f988dfeea08541d22 SHA-256: 55c4b3b15f40b5d95e5ddd7648b2999d384cef69e8e25b805ac2f25713455c16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to redirect users to malicious content. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to facilitate these redirection schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://derp74.fooden.com/UserFiles/files/motasenuwatixev.pdf In PDF document text
    • http://dietetyka-24.pl/images/files/vavexizofodaw.pdfIn PDF document text
    • http://katachizu.com/img/news/files/30005401704.pdfIn PDF document text
    • https://egca.fr/userfiles/file/32847221208.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/47723797243.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/duxodalulanedanime.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/48153942228.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/73721128989.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b09bdf37c---41760266897.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/3134728087.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/xevefejifabajit.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/vevuwunadadirepuweku.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2ba012f8487902e4a3f4c96efc9bc18b/76927942141.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/jelilovu.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/dotupojuwugadesujozonef.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/monaxurowazatojebituwama.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/59650184355.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/wotedixesodepipol.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/38780479531.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/tuwije.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/luwuborelinanuzanidukun.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/nitolisutanesogupodezefe.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/wudevuwodutowureromov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=natural+gas+pricePDF 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://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_off0000c558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC558 17336 bytes
SHA-256: ab49df5f46b68ee66471f6331c26989b89be79def0394bc7e066975242a654e5
font_01_sfnt_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 10404 bytes
SHA-256: 1a626e332ef2978a3d25d791ed152d181c2dcf79b79c961fbb3c6c9be21ceadf
font_02_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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