Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73e9a458fe5c345…

MALICIOUS

PDF

87.3 KB Created: 2021-05-09 08:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2f24fba7a61e9babd512175a16030a96 SHA-1: ffde762271ac778ee99e4dd7a89d8a573d85bc65 SHA-256: c73e9a458fe5c345a1239a22a5d8e0a1871bd84a6402a8dd4218e861825bc4ff
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 0.9997

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://soxebez.ru/strik?utm_term=what+is+a+good+title+for+a+book+about+your+life PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408987/normal_5fd9f881a6e45.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/how_to_get_out_of_debt_fast_and_save_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5fd7da641af3a.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/5gjCBge/bumenewalimanisuku.pdfIn PDF document text
    • https://cdn.sqhk.co/wituruxa/aheGUE5/neo_geo_mvs_buy.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/gjiifgf/deer_hunter_2018_offline_or_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/1gdhisg/steam_link_pc_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474223/normal_5fdae2177a783.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459780/normal_6005af18d54b1.pdfIn PDF document text
    • http://muxoman.mygamesonline.org/assessment_of_learning_in_tamil.pdfIn PDF document text
    • http://ninomut.sportsontheweb.net/pneumonia_types.pdfIn PDF document text
    • http://jatemiju.22web.org/benefits_of_technology_in_the_classroom.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/FQTohib/85793360710.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/ef1e90c9-ac18-4bcb-9cf5-33ce93cc3ae4/how_to_analyse_visual_analogue_scale_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b36eefc1-eb4f-4e46-afae-3c66d3bac03a/exerpeutic_900xl_extended_capacity_recumbent_bike_with_pulse_price.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_88faeed3f7a4400d99703aea9f947ef6.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_7ddc277a4dd54c9faec5816ad96bd61c.pdf?index=trueIn PDF document text
    • http://guxejusoselota.myartsonline.com/alcohol_abuse_in_south_africa.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_6bb842c0c6f54733aab2daa3280fdb3d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46194b71-416d-4244-90df-3bb13e6b5822/reduzubavov.pdfIn PDF document text
    • http://ribowiga.epizy.com/autocad_course_material.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_off000113b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B4 5488 bytes
SHA-256: 96ed6c48e873caad1cbe41a7a29bda00b1aa8781f34d4cd097eec55f5bd2a72e
font_01_sfnt_off0001266c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266C 11572 bytes
SHA-256: 29ca73161cbd973e3e22179b8e156e51c54330bf60fb4d41635de305045be34f

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