Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d1bc051e89b94d…

MALICIOUS

PDF

97.6 KB Created: 2021-03-02 17:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dd1c55f83b7b40b421fec0e6e12a87c8 SHA-1: 5e76f31d60398af750755c6ad8120e72b5193e60 SHA-256: a6d1bc051e89b94da6e1dbedc4f9c92a4539fa635e2147f658966825708d4e70
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://gimoguvi.ru/123?utm_term=riello+bf3+burner+troubleshooting PDF link annotation
    • https://cdn.sqhk.co/wubunepan/wK1jfhg/48710156375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453900/normal_602c56b995e27.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/asCwdIk/werewolf_online_wiki_trading.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/circular_and_satellite_motion_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/hd69gf5/30967537583.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463263/normal_5ffdf5cfc2336.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529095/normal_5fdd4351a5efc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372378/normal_6008092bc51cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405639/normal_60384325c113f.pdfIn PDF document text
    • http://votofeveta.iblogger.org/line_6_spider_valve_mk2_head.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393197/normal_60047eea26381.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445564/normal_5fed91de18bed.pdfIn PDF document text
    • http://goxezidoge.22web.org/botikiki.pdfIn PDF document text
    • http://sofisejulewog.22web.org/70630111639.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jepisaf.epizy.com/11857262332.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/49023600547.pdfIn PDF document text
    • http://nujugeteteda.myartsonline.com/mass_effect_2_crack_freedoms_progress.pdfIn PDF document text
    • http://vunaduwijumuz.epizy.com/cyberpunk_red_jumpstart_kit_world_book.pdfIn PDF document text
    • http://zofutigo.epizy.com/76245952734.pdfIn PDF document text
    • http://lekaleramitogal.rf.gd/how_to_write_an_undergraduate_cv.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_off000140c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C6 5132 bytes
SHA-256: 18d617393eab827bf891b73b82af3fe3e8d67c20eabbff655a297bf2f8a3aa27
font_01_sfnt_off00015242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15242 11600 bytes
SHA-256: 151b37ae0899b222ac5253d4939a51add76c7532af9b4f8dffa46888624191bd

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