Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfae667d4a36c57…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 22:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84a6fb8fb9ca04a0575e2561a8962033 SHA-1: 6095f8bcf606541ae2b9d98387c57c1a079bf800 SHA-256: cbfae667d4a36c573f53c9cb352d427d8bfb2175183c1b9f0507efb9b832bcfd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains numerous embedded links, many pointing to other PDF files hosted on distinct domains, suggesting a link farm designed to obscure the true destination. One heuristic specifically identified it as a 'disposable link farm on disposable hosting', further supporting a malicious intent to distribute or redirect users to 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://fallsplat.se/bildbank/file/83140121486.pdf In PDF document text
    • https://galaxytraining.examinationonline.com/files/51380313642.pdfIn PDF document text
    • http://idroter.org/userfiles/files/94428331678.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a10c09ec7279063702ec78669b8d146a/nopinuzukewipotinit.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/bowawubebesolomix.pdfIn PDF document text
    • http://infosierra.es/images/editor/68360833939.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/wefivirabuwa.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/50058721.pdfIn PDF document text
    • https://maria-galland.ru/files/file/folexevizekajezumop.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/11399427763.pdfIn PDF document text
    • http://asustainable.com/global/file/94926636447.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/71098793146.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/90567606364.pdfIn PDF document text
    • https://superlitefan.com/uploads/files/31356886256.pdfIn PDF document text
    • https://777mto.com/contents/files/30812814171.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/36453467712.pdfIn PDF document text
    • https://oz.korytnica.eu/data/files/16869812098.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/32864224404.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/cplma0m2tt5ll3f6hc0mq0q13e/muwuxazatiku.pdfIn PDF document text
    • https://mahae.hu/files/files/827377225.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/89330019936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=adobe+lightroom+photo+editor+%26+pro+camera+apk+downloadPDF 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_off0000b090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A2 17316 bytes
SHA-256: 24e18d6049cdabadcd3f887f3e1b449990e0dbaae1e198f76a775116dd3e22e7
font_02_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 10524 bytes
SHA-256: e80a0931d875875b69eeb3348ebc17485125d8da66b0a1488653d06ef902ca40

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