Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c9656e70baa50a…

MALICIOUS

PDF

67.8 KB Created: 2021-02-21 17:29:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 32a298819e6c993915b9b2f2abc146c5 SHA-1: 3b27bcb0b1b41dad2670db855d9b161c77e01be3 SHA-256: a3c9656e70baa50adebaf7fb08dc7953b5d82b79d141e3abca81f4e99df04faa
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://jottigo.ru/strik?utm_term=harry+potter+book+box+set PDF link annotation
    • http://nikecortez.net/alphabetical_order_worksheets_for_grade_6pmea0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453344/normal_5fdf3cf7e969c.pdfIn PDF document text
    • http://kuxalowakanuxed.iblogger.org/87164621442.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/292bfe.pdfIn PDF document text
    • http://kmikaerfs.ru/mapetonetabijemetibezaka2lfpt.pdfIn PDF document text
    • https://xapowukugo.weebly.com/uploads/1/3/4/7/134702937/baa725446c4.pdfIn PDF document text
    • https://jopixumux.weebly.com/uploads/1/3/4/7/134734794/6500532.pdfIn PDF document text
    • http://trixy-matrix.space/does_procreate_come_with_ipad_7th_generation0crr5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fikakoba.rf.gd/53291404737.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/logarithms_change_of_base_worksheet.pdfIn PDF document text
    • http://pibumox.rf.gd/jewellery_design_catalog.pdfIn PDF document text
    • http://xizefuta.rf.gd/can_you_report_someone_keying_your_car.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/chief_information_officer_hard_skills.pdfIn PDF document text
    • http://wijinap.rf.gd/nfl_fantasy_football_cheat_sheet_app.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_off0000c9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AC 5116 bytes
SHA-256: bd91b518e9b3cc3b1b9c4602dc9d770f2e559736f2f956b9ea0b1f90b78f2c16
font_01_sfnt_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 11016 bytes
SHA-256: 0caacb4876912aa4c3083c6f0f6e4dd7bf93192fba17d222b5fa44511d0e78b7

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