Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c899587f4fb97bf…

MALICIOUS

PDF

79.1 KB Created: 2021-03-25 18:29:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c0e4a28a98f1d1d41fae42dbbe8fd534 SHA-1: e6bda55ed4ffa33785c9a82d6346c7ada05bef71 SHA-256: 1c899587f4fb97bfcd0f706b46ee23b1ec50c956e5d3434ed40fa1b1ec1befbd
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://resalured.ru/strik?utm_term=2000+ford+ranger+canopy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415930/normal_600ba6f35bcea.pdfIn PDF document text
    • http://habirovradik.ru/how_to_make_a_daphnia_culture60yy2.pdfIn PDF document text
    • http://fosavaxenu.mypressonline.com/odisha_state_govt_calendar_2020.pdfIn PDF document text
    • http://reduslim-europa.site/6027849300smnyy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454671/normal_6010753cea24d.pdfIn PDF document text
    • http://visetazide.medianewsonline.com/19899080561.pdfIn PDF document text
    • http://kelimap.mywebcommunity.org/allyn_and_bacon_guide_to_writing_8th_edition_free.pdfIn PDF document text
    • https://pilopumif.weebly.com/uploads/1/3/4/7/134733378/vesizizumi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413240/normal_5fee3fffdef22.pdfIn PDF document text
    • https://jupimoxojufe.weebly.com/uploads/1/3/4/8/134860775/9485480.pdfIn PDF document text
    • https://serorufadorulu.weebly.com/uploads/1/3/1/4/131483245/5309815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_6038545fb3fdb.pdfIn PDF document text
    • https://gukabezifom.weebly.com/uploads/1/3/6/0/136051166/8b1aad3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444885/normal_6037efa8a4f98.pdfIn PDF document text
    • https://lovelutunaguj.weebly.com/uploads/1/3/4/7/134735325/4380672.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b218f5-0725-4d46-8048-7eb5aa4fa05b/89507972779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159f3701-db05-481b-baa0-e608af025863/thinking_map_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9edcdcda-4b68-4642-bce2-ebc256ba2a30/state_three_differences_between_arteries_and_veins.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_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 5392 bytes
SHA-256: 85a8a4dcb28db1f929505183427f223a0e80cbe8e3d4fd12a713e213fdbee994
font_01_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 11096 bytes
SHA-256: ba5908ca612bd6295f573f9889b1a159c4a0a69d88f46991f06dbbf41ded78f1

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