Malicious PDF — malware analysis report

Static analysis result for SHA-256 915caaa33314cd10…

MALICIOUS

PDF

77.5 KB Created: 2021-04-30 21:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 17f157ab0d4a11498cda5a3e787ba4a4 SHA-1: b15742388f3bc1def30d7f38134c246000426a09 SHA-256: 915caaa33314cd108575aeefa52ef222db0bfd8b291465945bc46718f64ea141
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document utilizes a link farm strategy with numerous disposable URLs, including one that redirects with a 'utm_term' parameter, suggesting a lure for specific search terms like '2000 ford focus repair manual pdf'. The presence of embedded URLs and the overall structure point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/strik?utm_term=2000+ford+focus+repair+manual+pdf PDF link annotation
    • http://testrun.ru/sowulowepugito2d8e.pdfIn PDF document text
    • https://pajujetijawu.weebly.com/uploads/1/3/4/3/134334360/xekedevokofepagu.pdfIn PDF document text
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/jupajowuroxofa.pdfIn PDF document text
    • http://keepmaxi.space/norogagodibitxbero.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450428/normal_5ff117fd95e9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452372/normal_601f70da5e35c.pdfIn PDF document text
    • http://thechambre.xyz/60010510467s650v.pdfIn PDF document text
    • http://fajutixosisi.22web.org/71852261942.pdfIn PDF document text
    • http://xazoxaruxilovo.iblogger.org/durability_test_of_concrete.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460247/normal_6009237af071c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450248/normal_602f210c08811.pdfIn PDF document text
    • https://wiloropijevor.weebly.com/uploads/1/3/5/2/135299547/mewud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_605f86435fb68.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/120111958y83kr.pdfIn PDF document text
    • http://forkidsshop.online/do_they_find_percy_in_the_son_of_neptuneaiwmm.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/600ecee5-e626-4cbf-a2e9-235514c9ad0c/85481786445.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/how_to_cook_rice_in_a_nesco_pressure_cooker.pdfIn PDF document text
    • http://riluromeni.epizy.com/free_yearly_expenses_spreadsheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/tumobusululovimi.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/beat_maker_go_pro_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f8112a-5466-4844-bc34-ee56a9b4675a/canon_scanner_lide_220_driver_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a65d83e-1b1e-4385-8c96-d3b90a135429/xivisenorifita.pdfIn PDF document text
    • http://gagelenobom.epizy.com/rhb_direct_debit_authorization_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/how_do_trees_grow_in_a_forest_class_7.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_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 5480 bytes
SHA-256: 0a6004d91a90e910ab7e2a84aa808e6ce8d634634417362a2f2cd92289edab95
font_01_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 10848 bytes
SHA-256: a5896bd9470dede01e90b64b467b5aec19b842c113b8e7a4f31b3aebf8d8d949

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