Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab606f51c2fa137…

MALICIOUS

PDF

69.5 KB Created: 2021-03-19 21:18:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: aeda33512c6276b072c93882b68c6991 SHA-1: 9236d8454167612019796f044428fa6a5be6c83e SHA-256: 9ab606f51c2fa13774cbe1b32dbb0d86e289f786cfef76fff48b617651ceeebb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high-confidence heuristic indicating it's a link farm on disposable hosting. The primary URL, 'https://gimoguvi.ru/123?utm_term=free+suffix+worksheets+for+2nd+grade', suggests a lure related to educational materials. ClamAV and an ML classifier also flagged this PDF as malicious, likely due to its phishing or trojan characteristics.

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://gimoguvi.ru/123?utm_term=free+suffix+worksheets+for+2nd+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425737/normal_5fdc6ad466b9b.pdfIn PDF document text
    • https://cdn.sqhk.co/vawupemowa/ZWhjhj3/smith_knife_sharpener_home_depot.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/jiDiigd/double_ear_infection_symptoms_in_toddlers.pdfIn PDF document text
    • http://tolujupa.22web.org/powerpoint_website_mockup_template.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/samsung_scx_3405fw_not_compatible_toner_cartridge.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvokitebixe/M4ifSyQ/pasexit.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/KIa8Die/zing_zang_bloody_mary_mix_recipes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422631/normal_60009ff396200.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wegijadisi.rf.gd/sapugemiwuwakizejusazokun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6de934b0-8249-4730-886c-e153e0c68b29/earthwise_24-volt_lawn_mower_battery_charger.pdfIn PDF document text
    • http://rijemow.onlinewebshop.net/define_cyber_crime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c33d1d59-c949-496d-a098-0d86ca159939/how_much_does_burger_king_get_paid_an_hour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79580b53-1726-49e3-9b07-118fd5425b65/69489475707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29e05d0a-bf44-407b-b563-368a9f363ec6/the_rise_of_scourge_manga.pdfIn PDF document text
    • http://suzifoki.myartsonline.com/26981338825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04dae604-47ff-49bb-ac33-9f26a1d392cc/73928824048.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_off0000d32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 5448 bytes
SHA-256: 95b9ff7256566ab52605e8aa369b901795cc75d8a188d4bb3009380b8cb0fd1b
font_01_sfnt_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 10260 bytes
SHA-256: 9fbba0c7aee4afcee08cb3b07cf2e77adca8b2b5d12896931d5d66cf3304dd31

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