Malicious PDF — malware analysis report

Static analysis result for SHA-256 566157b41d7297be…

MALICIOUS

PDF

102.2 KB Created: 2021-03-30 04:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2faccad3813c3c9c74b58d7f9e2fcce3 SHA-1: 9cd38d3975176cca9666d1893dace23b356300bf SHA-256: 566157b41d7297be6958d86d6f0456ae55458b61bfa0c6c7f437e409b9c9d785
186 Risk Score

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 0.9988

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://leonvi.ru/123?utm_term=la+boite+a+merveille+resum%25C3%25A9+pdf PDF link annotation
    • http://faceskinagainbeauty.xyz/mobepefojakokemiwami7or8.pdfIn PDF document text
    • http://bumosid.getenjoyment.net/the_romantic_age_in_english_literature.pdfIn PDF document text
    • http://prodive.su/fallout_4_companion_guide_maccready6igh9.pdfIn PDF document text
    • http://cetapp.xyz/mechanical_engineering_jobs_in_oil_and_gas_industry_indiaonjmn.pdfIn PDF document text
    • http://geekcods.com/41822762026sis6z.pdfIn PDF document text
    • http://petersikdar.com/97372312586ef27p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_f81c316ed8784c48a7b1b694bc262dcf.pdf?index=trueIn PDF document text
    • https://e62d90d9-845b-491d-b9b1-804d55ccd6e6.filesusr.com/ugd/6af1ed_5658d600482b42de9b724bed3319d27c.pdf?index=trueIn PDF document text
    • http://puruguniteri.rf.gd/bilingualism_research_paper.pdfIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_b02ffc3e8e9b41a981fd06bc9df8f2f1.pdf?index=trueIn PDF document text
    • http://nedofej.epizy.com/4690628427.pdfIn PDF document text
    • https://9177b9cb-4c70-42bd-a9e0-27a1bf53b67b.filesusr.com/ugd/9baf76_7b073f1d20e7479bb6fc4279fa560b39.pdf?index=trueIn PDF document text
    • http://gumizaxewa.atwebpages.com/kuzadexamalovirugana.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/aristophanes_clouds_perseus_greek.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_4a4cb52c177a4dff93ff5286faf13e4f.pdf?index=trueIn PDF document text
    • http://bijezum.epizy.com/pdf_to_word_macedonian.pdfIn PDF document text
    • http://ditajizuru.rf.gd/59965317961.pdfIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_39a78d10c80d4eeaa7c4bd718aa535bd.pdf?index=trueIn PDF document text
    • http://zutotakome.epizy.com/14134611561.pdfIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_b633e528942f4f14833ea5b21458d013.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_844a0bd3e1a04f12814a7440410a2b9d.pdf?index=trueIn PDF document text
    • http://lomipew.rf.gd/mimojuzesogilisomabe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11901 5244 bytes
SHA-256: 2e0560e57532fa432402da81d643c74b24ceb21f44ccc80643c0470566391fd2
font_01_sfnt_off00012a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A96 13180 bytes
SHA-256: 61ea2ee166b235d6b59f420736a8b49306e452eb9fa7d8ef6e35a68a90e81f79
font_02_sfnt_off00015470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15470 22508 bytes
SHA-256: f1dd855eb335d43581d2a55b4b2ad8c41363e783971409c62144a9f3d62675c3
font_03_sfnt_off00017af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AF4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3