Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4f0e59d37b3e21…

MALICIOUS

PDF

70.9 KB Created: 2020-12-22 13:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 61b8eea32a6bfd4a18e9a03f3c358555 SHA-1: c534c820db7361ddc806acf97c86243941c3bd60 SHA-256: 0e4f0e59d37b3e2166ec4d53d856db87582d7a405a37eb7876d9c6b8818b8534
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through a link farm. No scripts were extracted, but the presence of embedded URLs and the overall structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://gettraff.ru/strik?utm_term=azariah+pronunciation+hebrew In PDF document text
    • https://nizomepovunamox.weebly.com/uploads/1/3/4/3/134305669/b8e927e00a0e1a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_5f9a6c0dee504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_5fac0e4672d30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372735/normal_5fc60d660ff79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455380/normal_5fcdf9f48d126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_5f901e0189d62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe08e59ee0f32b871ac1ba/1606289637660/millionaire_teacher.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/physics_worksheet_magnetism_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/trig_functions_graph_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fff8d0dd-4122-4174-a4b1-c3601a24d128/foluninov.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/68024499581.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/cavatina_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8adb3cd6-17c8-4487-a1ea-24d23ef28c16/buvupajemomu.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/dixie_national_forest_weather_map.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_off0000d31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31D 5084 bytes
SHA-256: c7cb90e2d94be94815b16bb24c12232d14c8afcce5cd479e48e34f5985aee781
font_01_sfnt_off0000e478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 12528 bytes
SHA-256: 02eeb272a148bc5fa2af03459b1d99aa4643d5ae4d2e7f5d86cbfc880f87e7b0

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