Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a5f878c01bcbc8…

MALICIOUS

PDF

81.6 KB Created: 2021-03-13 15:57:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6b83f36d41b48d580fd06723e433227e SHA-1: 1749118851ce8f2e56f8a9a8992e56c1b64cc023 SHA-256: d5a5f878c01bcbc8d12ba0e3250571358ff916956f98a63bb2d2d5a7177d1cad
126 Risk Score

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-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://lozipotod.ru/strik?utm_term=adobe+premiere+elements+final+cut+pro+x PDF link annotation
    • http://theboldpantsproject.com/41313882220m0ahh.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/ipgdhUb/nogiz.pdfIn PDF document text
    • http://negozio50sconto.info/htc_m8_cover_flipkarttuc7s.pdfIn PDF document text
    • http://igcopyrightclient.com/building_self_esteem_activities2tzb3.pdfIn PDF document text
    • https://cdn.sqhk.co/busekonel/hhidid9/advance_directive_for_health_care_form_oklahoma.pdfIn PDF document text
    • http://bigtittybella.com/57657752192brk11.pdfIn PDF document text
    • https://cdn.sqhk.co/bobimugura/Rjap3hb/danapulotuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/wenisuvuroju/eyhchf3/topolepupeviliwiwodow.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/50456317396.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/nordictrack_c2255_parts.pdfIn PDF document text
    • http://gezetola.scienceontheweb.net/93312421590.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/JoDhjic/pesobifiroxotugofuf.pdfIn PDF document text
    • http://feelslike35.com/bubble_shooter_money_game_apkwlgkt.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/ejeHij2/ncert_social_science_book_class_9_download.pdfIn PDF document text
    • http://dsv-trening.ru/cessna_150_handbookoscao.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/choosemyplate_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/57322961377.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/xawexobemikase.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/checklist_formatting_slack.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/kajutevobajajibirataxawer.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_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 5496 bytes
SHA-256: 9fd4892518a274b9af10cdce4e18bffe52a856a9da661ad688e33b27ca6882b2
font_01_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 14840 bytes
SHA-256: c5422f9fca5081f15e8b8df567e38cc329ab28207b18d8279b24c159d5f93124

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