Malicious PDF — malware analysis report

Static analysis result for SHA-256 08175715c0424604…

MALICIOUS

PDF

68.5 KB Created: 2021-02-27 21:10:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4955f5c84be71c346025d8558d2c1568 SHA-1: 10c169dd231bd01eb8e3f99c9ae26575b37ee7c4 SHA-256: 08175715c0424604ce4ee15c71d59ade351472be3827dc754ab4d04d8028d9ae
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=office+365+sharepoint+development+tutorial+pdf PDF link annotation
    • http://hdvideo.design/rainbow_simile_poem_templateff4k6.pdfIn PDF document text
    • http://dvertsoff.ru/the_final_quest_rick_joyner_epubq8n2q.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/ia1QizN/screen_recorder_freeware_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419828/normal_5fd9d85b4d85a.pdfIn PDF document text
    • https://nenusobodi.weebly.com/uploads/1/3/1/4/131406558/3747166.pdfIn PDF document text
    • https://cdn.sqhk.co/gitaligido/jRfheUk/mujovizijatawej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446512/normal_5ff9fffe93a32.pdfIn PDF document text
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/8454248.pdfIn PDF document text
    • http://namedaun.fun/scikit_learn_is_a_machine_learning_python_packagekzj59.pdfIn PDF document text
    • http://rakuxijewimafud.22web.org/boom_truck_daily_inspection_form.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxeneson/ifxcgev/ferobenu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5fdf7f28f2608.pdfIn PDF document text
    • https://ranadapibefa.weebly.com/uploads/1/3/0/8/130874213/4037284.pdfIn PDF document text
    • https://radogatibemif.weebly.com/uploads/1/3/2/8/132815767/gureza_joboxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444351/normal_5fe518a015ed4.pdfIn PDF document text
    • http://baltika-trans.ru/693867460356nfj0.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
    • http://lilivuxaja.rf.gd/short_adventure_stories_in_english_for_class_8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18D 5804 bytes
SHA-256: 600498877bf4b6760d53672d9f0fdb5a7b1596eef84e0886709ff098bb5650b8
font_01_sfnt_off0000d51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51E 9720 bytes
SHA-256: 3bf10e9428db8415208608796255c91e1529b1894a4446e65cee32c2a68630bb
font_02_sfnt_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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