Malicious PDF — malware analysis report

Static analysis result for SHA-256 37709adaf4f29328…

MALICIOUS

PDF

84.6 KB Created: 2021-09-20 00:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bf97e49656f7c544f6b3a03ed358d95 SHA-1: 1f18787c07fd9e7d5bdbea56044e1aafd5a32d95 SHA-256: 37709adaf4f29328c46dad89007caaeccd1ef0e3b477dbb0549e57ede2e192c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF's structure and the presence of embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=how+to+install+iptv+on+android+tv+box PDF link annotation
    • http://luligang.com/ckfinder/userfiles/files/nagitetufizuwudu.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/xetivubinotoxe.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/gikukuteko.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/27866310293.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/68680784048.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/74626301890.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/71256770189.pdfIn PDF document text
    • https://sopkambing.com/contents/files/netatet.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/rakufojixebikejomexogarux.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/46762444030.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/21853896081.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/85377806895.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/mobaz.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/norikulagesefunare.pdfIn PDF document text
    • https://ksboutlet.com/file/files/gebuxatoxugib.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/koxopipuwoso.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/60919568892.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/sakobeluxiforitivadev.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/48433678678.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb466a290---xutazomiza.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/xubavomubinonogowum.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161357a9141ca6---buwisexusipumoro.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/lojejelesivebokewudaxapo.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_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 10636 bytes
SHA-256: d5fb8685d08c07c0fe4cbc924528f58f2a3337fa77442adc0c74f7c347162e0d
font_02_sfnt_off0001169e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169E 17784 bytes
SHA-256: ea56e56d9052f4e6c69aff088f78033c157ab352cd80a757f036349723686304

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