Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2bf2cee352ea0b…

MALICIOUS

PDF

73.6 KB Created: 2021-02-17 21:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c98b8eff19ee1b2ddd31bd515a5287e4 SHA-1: 7a84aade627c7bbbc762ff91bf7027e60702bebc SHA-256: bf2bf2cee352ea0b41b54a3c77840177b706f03d467d93c03c940304a1b88a63
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to disposable domains and known malicious redirectors, suggesting an attempt to lead the user to a compromised site. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common tactic for malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://yafferge.ru/strik?utm_term=inverse+trig+functions+integral+formula In PDF document text
    • http://blog-millionaire.buzz/learn_c_free_downloadz197e.pdfIn PDF document text
    • https://nodefosodetapa.weebly.com/uploads/1/3/5/9/135978328/9059734.pdfIn PDF document text
    • http://verifiedbadges-form.com/98532890935f08mv.pdfIn PDF document text
    • https://zasiranel.weebly.com/uploads/1/3/4/5/134507270/rutunidali.pdfIn PDF document text
    • http://titodisoke.22web.org/36213362052.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/catholic_bible_for_android_free_downloadzc49k.pdfIn PDF document text
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/rokir-ditozotoziduvu-robiruvaka-pevimu.pdfIn PDF document text
    • http://5gusevshop.space/american_hustle_life_bts_sub_indo4sw9y.pdfIn PDF document text
    • http://idealica-uficiale.website/articulo_123_de_la_constitucion_mexicana_completouku5i.pdfIn PDF document text
    • https://vobulesije.weebly.com/uploads/1/3/1/8/131857334/3557600.pdfIn PDF document text
    • http://boothattendant.com/67839543971k72gw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485308/normal_6025ae31a24a5.pdfIn PDF document text
    • http://olipaka.xyz/48217304048mgpwt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pumonufagatoteb.epizy.com/first_nations_canada_food_guide.pdfIn PDF document text
    • http://gogolozumer.epizy.com/bittorrent_software_for_pc.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_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 5196 bytes
SHA-256: 0ecfe45f8fb63b2a95c209d6332ec58d37ae4506e208649d8f91fd1672e2b0f5
font_01_sfnt_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 12308 bytes
SHA-256: 5894b5661f0237a9d9cbdb483aaaf3702bfcf19688557902d2345ac2d7d4bc2b

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