Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1b9ab7150393f9…

MALICIOUS

PDF

91.8 KB Created: 2021-03-24 22:30:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6ce19ee691dc49337c23a19177b5e442 SHA-1: 1233ca5ed3d6f64f2ec06b2708cdb67e99e76810 SHA-256: 3f1b9ab7150393f9ecf501af081d52484b79a4a8e0409f48870ae06f2f94a7a1
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://baarspo.ru/strik?utm_term=tier+list+sao+alicization+rising+steel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454043/normal_6015190c4f919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448547/normal_600beffb5d89c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403539/normal_5fe3a33312d96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375521/normal_5ff0e36c6be3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483870/normal_6025ca711f62c.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/jehdolU/piggy_go_rewards.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380528/normal_604702e333f26.pdfIn PDF document text
    • http://nopisodozig.66ghz.com/fivafodakanakemiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468563/normal_604f28ceaddf9.pdfIn PDF document text
    • http://appletopshop.ru/sodastream_co2_tank_refill_kit4cfvd.pdfIn PDF document text
    • https://cdn.sqhk.co/kotolodegag/bfSijhd/30931783809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411682/normal_605672ceb3145.pdfIn PDF document text
    • http://sreda.city/how_much_is_a_stihl_461qjepw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dudogiv.rf.gd/duraxidudobotegipip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87481970-07b5-4bc2-818e-1a486f790f42/amana_nfw7200tw_control_board_part_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b18d21d-7c9b-4383-bfc7-4cc28e901b14/eyelash_extension_waiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d307ca91-87d5-426a-8596-5f8ad3f3cc48/what_helps_animals_protect_themselves_from_predators.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43394682-4158-4536-9beb-241245025f18/99369458508.pdfIn PDF document text
    • http://numovid.epizy.com/how_to_check_transmission_fluid_in_2003_ford_f250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3772f7c3-1bea-45a5-96c3-607195a25a86/giwelejopejimuf.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_off00012907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12907 4964 bytes
SHA-256: 8a91479ecdb6a13c86967d3449883a9ccda29a1b7b70f1fdeae9bbd710df1ced
font_01_sfnt_off00013a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A00 11772 bytes
SHA-256: 21aa0fdd390587ac5c413ccaaca8e98365b83783d474dbcef68aad5dd1f716de

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