Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb691505218da008…

MALICIOUS

PDF

69.9 KB Created: 2021-02-23 02:06:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0bffa2d6d1beda596268f020ad6964ee SHA-1: dc53b7578b531441906491bf64c2a282cdf5bffb SHA-256: cb691505218da008238f89cf2e79434426534fbed390912342ca820ed0d24ae9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded links likely lead to further malicious content or phishing sites, and the document body's text about 'online technical analysis course' is a lure.

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
  • 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://maypoin.ru/123?utm_term=best+online+technical+analysis+course+in+india PDF link annotation
    • https://mevimozow.weebly.com/uploads/1/3/0/7/130776561/gulekatorobibof_kovijim.pdfIn PDF document text
    • https://tuwebuliwarukor.weebly.com/uploads/1/3/5/4/135400964/8710170.pdfIn PDF document text
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/6606411.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/bOlgdhd/wawutososod.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/neAPnia/vodosepuzusezorikinituwu.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/gRAfShj/real_rc_flight_simulator_2016_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/jhMuYgd/pixud.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/giiaigp/anime_stickers_for_whatsapp_apk_download.pdfIn PDF document text
    • https://bunavomotuta.weebly.com/uploads/1/3/4/6/134606544/ff86aebd.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/lawolorip.pdfIn PDF document text
    • https://cdn.sqhk.co/pamavunawi/KAu3zgi/microsoft_powerpoint_slideshows_and_presentations_apk.pdfIn PDF document text
    • https://nuzozixajalupik.weebly.com/uploads/1/3/0/7/130739607/4744988.pdfIn PDF document text
    • https://cdn.sqhk.co/binisomomup/jdQ0K2Y/98492564811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_6012df38912da.pdfIn PDF document text
    • https://goxufosoxewuje.weebly.com/uploads/1/3/5/3/135300646/6af9724ab8cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30B 5180 bytes
SHA-256: fe773dee98ac1494c191a8e1575cef75b4437ced77cde024c6921ce78afadce1
font_01_sfnt_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 11304 bytes
SHA-256: e85f55d56542131b0b1c39bb8051d93acd5e7822aa1df06e6186da04e1a7e479

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