Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49baac1166332b8…

MALICIOUS

PDF

70.7 KB Created: 2021-03-26 08:28:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 986a5aab1485efdea52d86807263086f SHA-1: cf418bcae6e27b33b1d3af1b82efb560dbd7f0da SHA-256: a49baac1166332b880d2e7c7867bd3cc5c8b6136d4d1f0d19a30cda0166c0fd7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery. While no scripts were explicitly extracted, the PDF structure and URI patterns are indicative of a phishing or malware distribution campaign.

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://botokaw.ru/123?utm_term=muscle+contraction+review+worksheet PDF link annotation
    • http://rigoditibalun.mywebcommunity.org/why_are_the_van_der_waals_constants_a_and_b_different_for_each_gas.pdfIn PDF document text
    • http://bigwin-1xbet.fun/49229314307mzlmf.pdfIn PDF document text
    • http://loveantravel.xyz/cuaderno_de_trabajo_espaol_2_secundaria140j3.pdfIn PDF document text
    • http://sokolov.fun/pressure_washer_pumpb6okq.pdfIn PDF document text
    • http://4bochki.ru/density_questions_and_answerswyrll.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/berliner_platz_neu.pdfIn PDF document text
    • https://cdn.sqhk.co/radofufalam/DAZZwig/ropemidovupumeki.pdfIn PDF document text
    • https://cdn.sqhk.co/tijatabov/9gjoUKZ/76983398136.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/gdjfepN/interim_report_meaning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/40052177625.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/14225919402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7969ee2-d37f-48d9-8b38-61971e5e2adb/bavorutovokipalogowozeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2928a29e-a7c4-4cfb-b493-fe7155268439/4490282563.pdfIn PDF document text
    • http://tulifal.onlinewebshop.net/how_to_play_havana_on_trumpet_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/guvojevemasidupazogew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34ac87f-22f3-4370-b645-1aa3012a1fb3/30567182378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4759a0d1-dcde-40b2-8d34-86d4b7a45e9b/remington_4620_chainsaw_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d95ffc3-1316-41c0-acde-09567fec7a21/49467165475.pdfIn PDF document text
    • http://zonafikepejese.onlinewebshop.net/relim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5C 4992 bytes
SHA-256: 9fe7bf63f2c7d9cd907b73c6180f283748dc2bffa69cf21aff759320582e9087
font_01_sfnt_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 10060 bytes
SHA-256: abee7f5f42d5870fd9032d7cabd28de029d4c9f5fc30534dd989ef2a9a8da642
font_02_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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