Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea091a9a99f1c8c9…

MALICIOUS

PDF

74.0 KB Created: 2020-12-18 23:52:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 571540f08bcc82f777dff12a6f7418f1 SHA-1: 9f1634766399c10c73fbcf4e9797c1617f6ba0a6 SHA-256: ea091a9a99f1c8c9895e93f07eb8ea6c8a4b4d0c369ec37505b9e77c3d1360cb
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'optical waveguides' and appears to be a lure to direct users to malicious infrastructure.

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
  • 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://cctraff.ru/aws?utm_term=coupled+mode+theory+for+optical+waveguides In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5fa5381390254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474719/normal_5fb717a594dee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f88d51ace1e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486772/normal_5fbcfa1613d2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404523/normal_5fd2550f4e01a.pdfIn PDF document text
    • https://waziketezu.weebly.com/uploads/1/3/4/6/134648841/fepinuma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426072/normal_5fbdce5e3276d.pdfIn PDF document text
    • https://bumatiwake.weebly.com/uploads/1/3/4/0/134096698/jemugifiwazegeba.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/873687d0-6259-4538-b8e4-740a858704e4/craftsman_door_opener_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be6c88cf-8024-4e60-8f2e-0e7b2b6624eb/mojumozoz.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/zataludizap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa26bb8b-ba9b-4aef-aef8-5a55033fc3dc/essentially_perfect_fit_summary_may.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_off0000e342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 5728 bytes
SHA-256: 3adf20a376a4fc1c6af92e883800f16e133a332771e3de4692d8a16a292ae298
font_01_sfnt_off0000f6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 10708 bytes
SHA-256: b1a1a7855775302181cef7e0ffce0f9cae66f2387c47025b9c1dd4bf24a72ad3

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