Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f811e0737e38c5…

MALICIOUS

PDF

67.4 KB Created: 2020-11-10 11:46:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 58a20bf66f360b94b7e1ebde1af86749 SHA-1: 852f6316d451b4e03193b13809c2ea8cbc1d7951 SHA-256: 17f811e0737e38c56572648e0e4ce78222ca3d43d3512f7f83a94085abd82da9
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV also flagged this file as malicious. While no scripts were extracted, the presence of multiple links to potentially disposable hosting suggests an attempt to distribute malicious content or conduct phishing, aligning with the Spearphishing Attachment technique.

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 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://gettraff.ru/aws?keyword=absolute+value+functions+and+graphs+worksheet In PDF document text
    • https://botomaluxezevip.weebly.com/uploads/1/3/4/3/134340767/bazezeronufokavaf.pdfIn PDF document text
    • https://sarununow.weebly.com/uploads/1/3/4/3/134366188/serenusenobes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386334/normal_5f91d73eee723.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/gikinigudatubelag.pdfIn PDF document text
    • https://wokozizexufam.weebly.com/uploads/1/3/4/2/134234926/mopapenukikujureli.pdfIn PDF document text
    • https://misopiwulasi.weebly.com/uploads/1/3/1/8/131856666/2ff12f6b457166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410448/normal_5f96c10473c76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wilugugo/voropijujimawabofirewe.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/tilatepitezujaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e306f74-717b-44de-aac3-19a1c54b43f9/fenaxavejofuma.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/21923074497.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/astronautical_engineering_books.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/from_the_odyssey_part_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/nepali_veg_food_recipes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF0 5644 bytes
SHA-256: 5aceab4d292390b4e19f83ad40c1c83ed0455d85434dff4eaba4fe8483304fe2
font_01_sfnt_off0000cf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF25 10324 bytes
SHA-256: 91ae76d4549703eee7ec2dd8e66777e6a1be416c9471af8b6ef0d49a7fa067d1
font_02_sfnt_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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