Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36cfbaf44f20d61…

MALICIOUS

PDF

72.8 KB Created: 2021-02-21 23:52:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 93475804759c1fab1a4f4413756af631 SHA-1: db46d1342d255010a97174ff2cee7dac49f60641 SHA-256: b36cfbaf44f20d610e3a24f49159f6a5f88a273f150cf5ef1ffd038e946719a4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The presence of numerous links, many on disposable hosting, suggests a link farm designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=what+is+the+meaning+of+out+of+sight+out+of+mind PDF link annotation
    • https://cdn.sqhk.co/jogowijalaro/gb9dVjd/warship_craft_download_pc.pdfIn PDF document text
    • http://photoforce.ru/citizen_nighthawk_eco-drive_pilot_watch0owc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470537/normal_5fd8bc9b3377a.pdfIn PDF document text
    • http://reduslim-ufficiale.website/kapebazikovupgjq8a.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/dorujuliponi4q0s.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/lRhdpj5/battle_in_seattle_movie_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/GjjL1jf/homes_for_sale_woodbridge_crossing_midlothian_va.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473938/normal_5fe5b3dbb25fc.pdfIn PDF document text
    • http://musofiron.ru/lead_document_controller_interview_questions_and_answersr1k0y.pdfIn PDF document text
    • http://shoop-fl.ru/9635006941331ngm.pdfIn PDF document text
    • http://storefromit.pro/solabawanijuvwfd45.pdfIn PDF document text
    • http://istlan.fun/jekawomenameliraxisukoded51kn1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_5fe611a3a753d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413845/normal_60165f65c99da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480736/normal_5feeee56aeeb5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zimozovo.epizy.com/manual_de_central_telefonica_siemens_hipath_1150.pdfIn PDF document text
    • http://jugoribomepi.rf.gd/50792256011.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_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 5204 bytes
SHA-256: e8bd2c199a958cbcf4f0223d19365f8a673c1bb50a523c979316cd1f614e37ac
font_01_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 10428 bytes
SHA-256: bce355270308333eadb85abe7098a6ee35c29b705aa69b92a061da623fa24f02

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