Malicious PDF — malware analysis report

Static analysis result for SHA-256 241c87b2302aa35a…

MALICIOUS

PDF

74.3 KB Created: 2021-03-10 04:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fd4608eea3ecd5cf5a2223d9a86c9040 SHA-1: 382589fb3a3b84ae6f613ad9376ef8e37618d668 SHA-256: 241c87b2302aa35a355aba9248c262231d90cdd6aa22bd06a83519b70624f74f
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-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/strik?utm_term=shimano+di2+junction+box PDF link annotation
    • https://cdn.sqhk.co/lelabepena/iyaii1u/11113770189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448549/normal_603aac586024e.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/5yevijx/hmrc_uk_tax_contact_number.pdfIn PDF document text
    • http://magawiwove.22web.org/2813338742.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/hfgihhz/make_your_own_music_video.pdfIn PDF document text
    • https://cdn.sqhk.co/wedegetuso/siijbdE/app_vault_miui.pdfIn PDF document text
    • https://cdn.sqhk.co/rovovuroj/c6ogckO/can_decaf_coffee_raise_your_heart_rate.pdfIn PDF document text
    • http://saramofupoke.iblogger.org/fixakekixanurajovepit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463788/normal_601b03b7aa368.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/3bhjieu/13860786207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412165/normal_5fc654bfba506.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/8cd0a81d-82b8-47e8-91e2-4d4460a9d729/makalagetogifulukavuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bb6f846-4cbe-4d21-aba3-b9f9dc744ad8/93675682016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a81c127-d803-4704-8cc7-454a1dcb2d9c/vorerefodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73c07951-60e9-4530-980e-8de46490eba7/gluten_free_fast_food_options_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df4edf82-6fcf-4688-a42f-a0af6c316a1d/lejene.pdfIn PDF document text
    • http://lopogoroje.rf.gd/31706881469.pdfIn PDF document text
    • http://zopefunexot.epizy.com/beyond_meat_earnings_report_forecast.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_off0000e617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 5392 bytes
SHA-256: 18e3dff6b9d35c96daa2a1e3deddf21959e4b79ff2b600c69d8369b59f0ecf98
font_01_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 10608 bytes
SHA-256: 8ebf1bbdb22744171bf31f93d89c197af155aeaf53c3cae0977d074c24fe7f8b

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