Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b5932b3b1ceda0…

MALICIOUS

PDF

83.0 KB Created: 2020-11-11 23:20:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 649e99f4c8b7b3df4d2ed99ce67bf7cb SHA-1: 0c308d59d4550156535307d2318c4dd3fcc8f814 SHA-256: 99b5932b3b1ceda007f3ecc9a2f82fa3cfdec60f983204f7e42006c1210f3dab
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing. One of the extracted URLs, 'https://traffset.ru/123?utm_term=casio+sgw-300h+user+manual', is flagged as unknown reputation and is likely the primary lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing.

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 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://traffset.ru/123?utm_term=casio+sgw-300h+user+manual PDF link annotation
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/sigiw.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/jitimesolagun/55107723471.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/career_paths_banking_teacher_s_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baa26c81-9799-465f-9a8e-5df94332bd9f/35866647504.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/beluseretelerunez.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/wekufupiviwiboxivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db65b87a-88c9-4904-8944-258ee6d00829/kahoot_que_es.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64147fd8-d4fb-4c59-8075-9c31a68cd7f2/1st_time_penalty_abatement_request_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a14cf2a-d5d4-40f3-8adb-3dc77305ae37/61762186879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63b28eea-9825-4b5f-b0f3-17e2f6ec4730/stephen_king_short_stories_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34c863ec-ae51-4a4f-9f19-3cdfbd03a09a/ligex.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/tangential_velocity_gear_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff8e2be-ef28-4d01-a35b-c24c68f8ff3e/34909678717.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/37288894913.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/project_working_capital_management.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_off0001078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 5436 bytes
SHA-256: 03433fe0ccfcb64b5e57a083c8fb2019444ad72118eadaf7eb05e377ae59e600
font_01_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 10928 bytes
SHA-256: a5893338877bcf6bf99d2596c27db7e6c6fe1948904b533713ace052b3761eeb

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