Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3610338f7e8dc1…

MALICIOUS

PDF

74.6 KB Created: 2021-03-27 22:02:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 01f625eaf8cecc3ae28842922cdd2d07 SHA-1: de6de04583575157c071939497349e959f8752c6 SHA-256: 5c3610338f7e8dc1a4c168b2ae5ef43f756e5040397ddabd98cb44cc93efedfb
156 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 5

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=how+much+is+lebron+james+worth PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447465/normal_5ff91a1e6780a.pdfIn PDF document text
    • http://fbdirect.site/instagram_story_app_iphoneyvt6a.pdfIn PDF document text
    • https://lifexusubanipi.weebly.com/uploads/1/3/4/3/134377686/bovif-fotepevovo-gower-kalabex.pdfIn PDF document text
    • https://jabexigiji.weebly.com/uploads/1/3/2/6/132695602/6594588.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485828/normal_5feb2e8410d86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499979/normal_603188b2c839c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413126/normal_5fe3eddb937a0.pdfIn PDF document text
    • https://cdn.sqhk.co/kebabefepu/jdejaiq/soviet_posters_pull-_out_edition.pdfIn PDF document text
    • https://pizeposinejuxow.weebly.com/uploads/1/3/2/6/132695365/banufi_lisade.pdfIn PDF document text
    • https://cdn.sqhk.co/xozifejor/YaicXOH/65082488109.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenixa/jj0gjfY/free_music_videos_on_roku.pdfIn PDF document text
    • http://opt15.ru/principles_of_electronic_materials_and_devices_3rd_solution9estx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_6049500ccde2b.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/gjogcih/battle_tanks_2_unblocked.pdfIn PDF document text
    • https://resusogid.weebly.com/uploads/1/3/5/3/135346187/rinidasan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426263/normal_5ffb60508dadf.pdfIn PDF document text
    • https://dizugupixaxagoj.weebly.com/uploads/1/3/4/4/134440249/xawunix.pdfIn PDF document text
    • https://fuxijisolano.weebly.com/uploads/1/3/5/3/135348953/marulefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_601d7020d085f.pdfIn PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/rupekakutapanu_golowulotavile_favuzukibal_jaworarofepo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53E 5308 bytes
SHA-256: 86b2da8fc7e4b1713b072b97b3f1ce31a84aa99c26ee7dda30024c4c690131cb
font_01_sfnt_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 11040 bytes
SHA-256: a5fcef2318b70cba0688308929ff772a4554a81cf8973ff93c3012f5e50cff0e

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