Malicious PDF — malware analysis report

Static analysis result for SHA-256 455d227fab27f968…

MALICIOUS

PDF

72.8 KB Created: 2021-03-10 12:30:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6fc2eb97947a3ba66ac81c33c0967c46 SHA-1: 9543dda5ae634b308f6168c65245c0bd02c5dd0b SHA-256: 455d227fab27f9685f6342b7eb9604db441135aec25dbb29d432c605cc7ca16c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=best+used+car+under+%25242+000 PDF link annotation
    • http://kieverts.xyz/witakatajapotatghycd.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/Ohhjba8/mechanics_bank_downtown_mansfield_ohio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_5fdc14be8598a.pdfIn PDF document text
    • https://cdn.sqhk.co/juvokapo/HNmgJif/ffxiv_white_mage_leveling_guide_shadowbringers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_6013c3596d502.pdfIn PDF document text
    • http://hdvideo.design/vampire_s_kiss_full_movie_streamxk85e.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/eC6Njd3/bee_brilliant_blast_game.pdfIn PDF document text
    • https://cdn.sqhk.co/liregevo/eigifje/xezufumibutipalekefone.pdfIn PDF document text
    • https://cdn.sqhk.co/zipuzedozame/eigPasl/jungle_castle_run_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_60436c4d8399f.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/pisces_connection_with_god.pdfIn PDF document text
    • http://organic100.fun/2012_jeep_grand_cherokee_fog_light_bulbs8lavb.pdfIn PDF document text
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/7253126.pdfIn PDF document text
    • http://shlifovka-pol.website/dejunilukiritinivp0dg.pdfIn PDF document text
    • http://businesslinecenter.com/xonopusovezegivanidafix1jal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_60127964ebbc2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_6510949ff7e8479f8b962bcc7e045eac.pdf?index=trueIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_f99c6fa7478846d4bd27f7c417420c4d.pdf?index=trueIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_de4b69424c2c463ebe61a0f1d9ca6970.pdf?index=trueIn PDF document text
    • http://zesafemumibow.myartsonline.com/strategic_marketing_process_ppt.pdfIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_56d6849173d548f3b6d3d4fbedc5cc1f.pdf?index=trueIn 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_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 5464 bytes
SHA-256: d54c4612cf502a611b1146f84552a3d9b4a6798da70e032873777b69fd6cb868
font_01_sfnt_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 10360 bytes
SHA-256: f914613ee8ed930980ae034dd4e656448bcea78f5403d8392dcc3a2bc881f713

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