Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5fd96b4fe1769b…

MALICIOUS

PDF

69.1 KB Created: 2021-04-03 14:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cc4f120123116897ae603e4472a911dc SHA-1: 73bb27ca31d42d301229ef9e4b96cf2f15af992b SHA-256: 0b5fd96b4fe1769b8b4a6f49d36429b604917db3c2b816f986d9200599f4dd77
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 0.9998

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://ponafet.ru/strik?utm_term=weber+spirit+2+e310+instructions PDF link annotation
    • https://gegivibubijob.weebly.com/uploads/1/3/4/5/134507206/ee16f6ad39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488592/normal_600d3be95caf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422367/normal_60093a96bfd08.pdfIn PDF document text
    • http://tonivatibiri.22web.org/vikeneduxivonu.pdfIn PDF document text
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/8484577.pdfIn PDF document text
    • http://sotaredojowiba.iblogger.org/zofuretebaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_45afeebf221f4db6bd3dad7edb1e09b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b419abe6-6e09-4021-93f5-1ed0f12194b2/scale_drawing_worksheet_grade_6.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_24b613c09b394a53b5599e3be470545a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4041e0-c664-4ff8-91e9-e135b4dfebd8/kobewipawurelafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd91f2d-0bf2-42c9-b0c3-da2d974143f6/words_with_roots_grad_and_gress.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b29c7c-391f-4cfd-8779-752382b4bb10/from_god_to_us_how_we_got_our_bible.pdfIn PDF document text
    • https://2ea3657d-1c4c-40dd-8491-58aeeb8dc933.filesusr.com/ugd/18a85a_92b3b65f18c04ebcaa526f0cdf413c61.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9933a75-0fb6-47c8-a67c-3ab8cecdf7fa/34801695690.pdfIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_42beec215c844383848f12aedf2252c9.pdf?index=trueIn PDF document text
    • http://fomabobas.epizy.com/forsyte_saga_season_3_episode_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd68503e-498e-4157-9e9a-10bf99a974a7/xatebogevuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d62ed7b-ef7f-4dbe-b5b1-8cbb14555f9a/como_hacer_una_corona_de_adviento_2020.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_off0000c712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC712 5328 bytes
SHA-256: 18462e4964e0a6675f4b6717e5a95902a592f0255f9c4a92ea262ec296894395
font_01_sfnt_off0000d957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD957 14580 bytes
SHA-256: 19146b1921a08720ca814a72aac415142471fcfc0ccdfeffc592f174f1cdd224

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