Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df489d2529c3bfe…

MALICIOUS

PDF

64.6 KB Created: 2021-01-10 18:33:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cb3aa6913ef3ba2ce645426f5edd2cce SHA-1: ed5c64058ca6f19cdc4d43590083312db7e5cff3 SHA-256: 8df489d2529c3bfe29bc60c57edf71b3776cfd10f9e5dbe9b23c324e7c3d50aa
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links to external websites, many of which appear to be part of a link farm or redirect to malicious infrastructure. The heuristic firings indicate it's a malicious redirector and part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://cctraff.ru/123?utm_term=atoms+vs.ions+worksheet In PDF document text
    • https://tonefomemozev.weebly.com/uploads/1/3/4/4/134458928/9663720.pdfIn PDF document text
    • https://site-1175108.mozfiles.com/files/1175108/64076632407.pdfIn PDF document text
    • https://site-1166732.mozfiles.com/files/1166732/vabizitodoxafalewim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486763/normal_5fc9cf43d54a1.pdfIn PDF document text
    • https://ramimuluvisefo.weebly.com/uploads/1/3/0/7/130775145/berodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_5fb2eebb770ee.pdfIn PDF document text
    • https://somolepudurupe.weebly.com/uploads/1/3/4/3/134332146/798bed494b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393181/normal_5fa6f8e030f35.pdfIn PDF document text
    • https://site-1175354.mozfiles.com/files/1175354/xevajatasonik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407729/normal_5fcacde5f1fce.pdfIn PDF document text
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/f96f89335cc4.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/wapilavuxes-tiriradu-nagidubatajo.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/sowewazulejewi/words_with_astron.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_off0000c210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC210 4920 bytes
SHA-256: 710f79ca815ceb95fe600db076c8becd34331deced5953cc16d3590246d34f3a
font_01_sfnt_off0000d2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BC 9888 bytes
SHA-256: 802bffa5c022e86b25e8c96b5a0448d6c87d38ae24ca0e146fa9bb4830a492e7

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