Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24c8cefb5782fa4…

MALICIOUS

PDF

76.1 KB Created: 2021-03-11 09:28:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 70c321ddeb1a0a52085972edf6962822 SHA-1: 71be8eb4c513d977b750c16776fa108b3091da74 SHA-256: d24c8cefb5782fa46044a14ee71668afeb0b6598731532098230dc28506a757b
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-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://crophysi.ru/123?utm_term=free+printable+math+worksheets+algebraic+expressions PDF link annotation
    • https://cdn.sqhk.co/vasibejovej/4ihQjjQ/pathogen_meaning_in_bengali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480749/normal_6010d8dc008e6.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/hfigjhc/bomber_jacket_with_patches_women_s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426676/normal_5fdc95104c223.pdfIn PDF document text
    • http://propovar.ru/javascript_tutorial_udemy_freeze4s4.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/YWiiCMS/sound_pressure_meter_project.pdfIn PDF document text
    • http://bas-vorota.ru/toy_freddy_skin_planet_minecrafttlu3g.pdfIn PDF document text
    • https://cdn.sqhk.co/foxezevewa/fhgLqya/13437894752.pdfIn PDF document text
    • http://rte-ita.fun/gixedavodojw5n5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369142/normal_5ffec32ed50be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wetovokerug.epizy.com/mikimifituxelefo.pdfIn PDF document text
    • http://fukefuxatolu.epizy.com/bmw_320i_m_performance_2015.pdfIn PDF document text
    • http://jometuxinuvalal.epizy.com/1045803235.pdfIn PDF document text
    • http://zararogesa.epizy.com/nis_directive_compliance_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/akasam_enatido_telugu_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/consumer_reports_appliance_reviews_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/40650584502.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/segizezapewafuxovomipegil.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_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 5664 bytes
SHA-256: a158361c091a89945836fe8ff7203a22bf8f1c8a628e85449b76259400ea0e8d
font_01_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 10820 bytes
SHA-256: c6220d1ca4b26e15336cdeaf716c4635bf7b99b53280ae75cf967323cdac88ac

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