Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a245dfea3cc3f2…

MALICIOUS

PDF

69.2 KB Created: 2021-03-27 14:22:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0d4d0139b3dfc26cb8592395c8142c12 SHA-1: b76030e225a03881fc3df2c8e3b73423ae243c34 SHA-256: b1a245dfea3cc3f28282e1126694598243e46bbb559ca2e34d56a96b3ec2c7ba
156 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. 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/wix?keyword=atomic+dating+game+worksheet+answers PDF link annotation
    • https://taxupolejunak.weebly.com/uploads/1/3/4/6/134663048/nalerilu-xekaresebaximum.pdfIn PDF document text
    • https://cdn.sqhk.co/rigowodikot/jieieig/52498170212.pdfIn PDF document text
    • http://valuburikodajad.medianewsonline.com/how_long_is_the_grace_period_for_drivers_license_renewal.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/canon_mp160_printer_ink.pdfIn PDF document text
    • https://cdn.sqhk.co/tosemixuru/j0hgaNS/bluestone_and_hockley.pdfIn PDF document text
    • https://cdn.sqhk.co/jumivosokigo/ehcHihv/nuwux.pdfIn PDF document text
    • https://kepegefamoza.weebly.com/uploads/1/3/1/3/131398453/2cbcb581ba.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/sulasatevirexo/xubasagimevakiburumosite.pdfIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/ruwoviroxuridolilum.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/bhajan_free_for_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43847d85-45cd-4a07-9009-e4b6763ecbc6/75341999687.pdfIn PDF document text
    • http://jitawidavez.atwebpages.com/30546248138.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/ford_mustang_convertible_or_similar_enterprise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94e0ed05-3a02-439c-99ea-74bfb767d516/furokakelonufutupog.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/electrical_engineering_interview_questions_and_answers_bangla.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/masters_degree_public_health_administration_salary.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/gufojomejidudipinil.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/sass_bootstrap_sample_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/depuzakawuzatusamuwos.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/fevenovo.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_off0000d0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C1 5468 bytes
SHA-256: 60bf7b3a87b2ad5975805235a6a1d42e8d72b16b1037fc8e49c8b06f9d966eb7
font_01_sfnt_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 10676 bytes
SHA-256: 71014107d21b24bb8454c38f127fd7059a337cca68b83cf337eee05328849909

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