Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e6b1287942f975…

MALICIOUS

PDF

62.4 KB Created: 2020-11-26 07:04:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7c247910a72050ccdddaa3ed9ede0101 SHA-1: 396b720bc670d863188fe78111f57de203f8a674 SHA-256: a8e6b1287942f975520055f3ac65653e8ff9984737cee8080271971a6449f429
214 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to study guides, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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/strik?utm_term=vocabulary+and+study+guide+answers+for+fahrenheit+451 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_5fb88643acdaf.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/juxexiwadopi.pdfIn PDF document text
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/2997139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_5fa3b52a7ba9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5fb832b0eae81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6abd3b1f-f401-4520-9a11-65938eb2adc4/jijezetebiwijagusafakasol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fef6b4b-d80e-4f7a-a165-c88ade7a1682/kugiwexixerude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27ce5b7-bdf0-4a8d-8c8e-c3d77416623a/11677579175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2499daa6-411d-4bd3-b244-db93d140727a/screwtape_letters_audio_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/nbc_connecticut_news_reporters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e9f134-c96b-4440-b20f-cb39694e0ed6/13396088353.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_off0000b1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B9 5844 bytes
SHA-256: 4985a69be4d6f2bf953e8e78d85fa6e7836ab5e689f436d49f6e5feaa93f18d9
font_01_sfnt_off0000c5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BD 11392 bytes
SHA-256: 1ded76a8d3150bb5d75798396ded7f16e96c99b1b8f7a56854e44c331c10f63b

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