Malicious PDF — malware analysis report

Static analysis result for SHA-256 52432d4d6aecb58f…

MALICIOUS

PDF

75.5 KB Created: 2021-04-02 12:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6e48ac010b3dd0403c0026b62e62253b SHA-1: 23c39c1d5ced3944ba6dca4e28243a3dbe303085 SHA-256: 52432d4d6aecb58ffa90f56e54a0651e504491f636274f44c6a24abdefc19588
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=greek+gods+yogurt+flavors PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369520/normal_603d1a5d9cd45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489409/normal_6057dadf068ad.pdfIn PDF document text
    • https://movudari.weebly.com/uploads/1/3/1/0/131070737/7819287.pdfIn PDF document text
    • http://gufubugab.22web.org/google_chrome_dev_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447250/normal_602bee92046e8.pdfIn PDF document text
    • https://tokarakuwo.weebly.com/uploads/1/3/0/9/130969339/8c7d1bd393e4.pdfIn PDF document text
    • http://maripifedama.22web.org/nekutinipofemi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389097/normal_60320eab664b2.pdfIn PDF document text
    • https://momaramurelu.weebly.com/uploads/1/3/4/3/134309976/7d12199cd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384028/normal_5ffcdbbc15ef6.pdfIn PDF document text
    • http://rapelubide.22web.org/29111732333.pdfIn PDF document text
    • https://bafizotadax.weebly.com/uploads/1/3/4/7/134761596/366f7bea294a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ad2b99-5037-43c9-83f4-cc093d78c680/85104594112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/997300d7-9485-4a92-b2b4-a1d16083cbbe/83380239650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe942d8b-bfd5-4134-b275-717e56d6be44/how_to_get_dunkin_donuts_delivered.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e9ad5e0-cc00-4757-be74-108378368824/eaton_fuller_rtlo18918b_transmission_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59bf193e-5e49-4304-b2ca-e1079796a8ea/mivalo.pdfIn PDF document text
    • http://wuzuvulas.epizy.com/gas_water_heater_installation_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc80898-79b5-4cfe-9ee6-2b61b9aeba04/79963342952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd67e98-1335-4e7b-9d36-dac299e4ccc3/how_to_put_together_arctic_king_air_conditioner.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 5332 bytes
SHA-256: 541c65105e9614d861a449a57e4507f498bc42d64526f3792b55383184d31827
font_01_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 12264 bytes
SHA-256: 88cbc8b6de5b39e73b55cdb0472a8bb75bd8b08580e04567c1ec0f2a89d39c6d