Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb3541634de36ce…

MALICIOUS

PDF

71.8 KB Created: 2020-11-14 01:17:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5425a74c9ace3c6614912469dc1c770e SHA-1: bd3e444afcf58f0504f15e2b236877766ae7443d SHA-256: 7eb3541634de36ce19ad0610a627244c5a4faa7712101185461e3de54784d8c6
156 Risk Score

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 0.9997

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://traffnew.ru/123?utm_term=drexel+university+pa+program+tuition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403413/normal_5f953353b4477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375517/normal_5fa1e4605d3e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f9c8d8abbac1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f87343e91cd8.pdfIn PDF document text
    • https://pojetepanale.weebly.com/uploads/1/3/4/3/134361345/8450300.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/fasanag/case_studies_in_pharmacy_ethics.pdfIn PDF document text
    • https://s3.amazonaws.com/bodepova/leputedimojinusodovaxak.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/keirsey_temperament_sorter_answer_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b377dba1-b6e7-4683-a507-ae83ec19b3db/como_evaluar_la_escritura.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/96861993160.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/kids_guide_to_the_internet_1997.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_off0000dbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 5368 bytes
SHA-256: e44037851b6cb111097111b890c1757510ceb3762fc2f8dde6d888aec0ae011c
font_01_sfnt_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 10560 bytes
SHA-256: 9e4be0e4054cc8eca49a380521b459bc60045761ebac4fb9f474de14c7271dc0