Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68e654fc79c6616…

MALICIOUS

PDF

77.6 KB Created: 2021-05-11 14:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 14f806bcf3364bcd764b0b46f1cd60ee SHA-1: d8f5de56bdb42319b3382fa331c642802dc0f06b SHA-256: c68e654fc79c66168b8e1361f0804ab436484945fb75856db7404f81ef474d7f
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://vilenefex.ru/strik?utm_term=java+for+dummies+7th+edition+review PDF link annotation
    • https://cdn.sqhk.co/sufadoma/jbOij7Y/how_can_i_change_my_voicemail_to_english.pdfIn PDF document text
    • http://discount50.pro/57883007305qmnfm.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/caG34ZG/zagiwowuwaserejenujiduv.pdfIn PDF document text
    • http://fbdirect.site/64797109101bdpj0.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/DifgcrL/66802094354.pdfIn PDF document text
    • http://just-gopro.com/31674918223ge9tc.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/c4fd3372-17a8-4d44-a9bb-cbe172578c34/bexiwaterodomilit.pdfIn PDF document text
    • http://zibakogemigana.rf.gd/1135304874.pdfIn PDF document text
    • http://binasizula.rf.gd/descriptive_analysis_in_spss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a0a476-f753-4759-8943-548e28bd96f2/1048257338.pdfIn PDF document text
    • http://nabifasilazug.rf.gd/viva_water_dispenser_instructions.pdfIn PDF document text
    • http://zugukasamudin.epizy.com/82578565443.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/criminal_justice_system_in_nigeria.pdfIn PDF document text
    • http://xuminigodadiveg.rf.gd/515263859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2552fd0-2170-4a76-ac98-a30122a7f08b/peavey_classic_30_combo_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/node_js_print_html_to.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_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 5336 bytes
SHA-256: 573a10a4a3f9805da59ee0229251d02f5b91995798860ce43edbeca0e0085508
font_01_sfnt_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 11072 bytes
SHA-256: 2c62108a6a25cfe5afc9b8e77d0106c7ce841cd7b33d4222e812e0da3fcab64a

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