Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f751a856dad482…

MALICIOUS

PDF

83.1 KB Created: 2021-03-25 12:10:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b7170b36351e20fd0993c52b3e4976f3 SHA-1: 1e1a9ffa0838317dbf20bea64cb27797a10237fe SHA-256: f6f751a856dad482085eb7f488f63bdb95826aed8251096dcba3921d72327499
166 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. It uses a password-protected-archive lure. 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://botokaw.ru/123?utm_term=alagey+alagey+album+song+ringtone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459166/normal_60494b48c77af.pdfIn PDF document text
    • https://cdn.sqhk.co/netesatova/8Cjciaw/carbon_cycle_introduction_worksheet_answers.pdfIn PDF document text
    • http://makebugobiwuka.mypressonline.com/lulobegazufivatisawowi.pdfIn PDF document text
    • http://zujewubowufonug.scienceontheweb.net/bringing_down_the_duke_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_605c1a4f22448.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488137/normal_600372db48411.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409095/normal_5febf2a7d6926.pdfIn PDF document text
    • https://cdn.sqhk.co/bafesugoguwi/CSjfiie/soothing_sounds_for_sleep_free.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/why_isnt_my_aux_cord_working_in_my_car.pdfIn PDF document text
    • http://vofovadero.22web.org/2492631751.pdfIn PDF document text
    • http://mitoxewu.22web.org/55921670969.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafevela.rf.gd/environmental_bioremediation_technologies.pdfIn PDF document text
    • http://wofavum.myartsonline.com/suffixes_worksheets_3rd_grade.pdfIn PDF document text
    • http://lowadof.epizy.com/zapuvodilenojedi.pdfIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_7fea101f85d8457da8564fb6592bab6a.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_5eaff1e0472a413799a2410c69b391df.pdf?index=trueIn PDF document text
    • http://xatenekoroxaju.epizy.com/american_idioms_and_phrases_with_examples_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/smoothie_recipes_healthy_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/92415777490.pdfIn PDF document text
    • http://tulajadulixo.myartsonline.com/40178874479.pdfIn PDF document text
    • https://37dcb74a-b492-4e6c-94d7-6984b04a3d7f.filesusr.com/ugd/01eaca_3a3ced80d4bd41c193a720938b1805bb.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_529350a0c2ca42969b75cab119352c90.pdf?index=trueIn 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_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 5236 bytes
SHA-256: 70f394ef9448ddd2677358998df7689d39c60344ca1017d8882bf016f0a5541f
font_01_sfnt_off00011849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11849 11448 bytes
SHA-256: e7d8b8691934db6bfefb35efced65f8ba209677bd515964e4c8002e3e9fbc24c

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