Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3356597219598fd…

MALICIOUS

PDF

68.5 KB Created: 2020-11-12 13:36:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 614d6aab44291b439f4f19786951ad2f SHA-1: b6a09ddd65ecde25445799587c43f6511b739950 SHA-256: b3356597219598fd6ba43328f5987f037cfba81a83a22a74536e13ecc2444603
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDF files hosted on disposable domains, suggesting a link farm designed to distribute malware or conduct phishing. The presence of a link to a known malicious redirector further supports this assessment. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://traffine.ru/aws?utm_term=appraisal+feedback+form+sample In PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/7c8d21b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367923/normal_5f8758b8b5af4.pdfIn PDF document text
    • https://bososafevibusup.weebly.com/uploads/1/3/4/0/134041518/xozututemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471256/normal_5fa4073eaec40.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/b921acbde32eb.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/sokilijaw.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/2934732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f8d288e3199b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_5faa482c06110.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/vukumesoj/international_accounting_standards_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae6fa52f-a9ff-4fac-8051-eafc949fe310/zevob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/274be01d-9461-44de-9b2a-9a907aa35b77/duwutosixekipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb43d2d-78a9-4911-9fad-8a03bc922a5e/11362062624.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE8 5492 bytes
SHA-256: 0a376bb8e433d12ec3d3cb6b607eb0941b4ac5c6ecb7d63164328e0ec46f3bdd
font_01_sfnt_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 10516 bytes
SHA-256: 39f4f2a1fa66a5791ee13fdc0d717f109fd39e5fc89c012f0633095070f0fa40

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