Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea0fb6413d47294…

MALICIOUS

PDF

53.8 KB Created: 2020-11-06 03:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 150cdd9d931cd79481296e0600f86bd5 SHA-1: dfadd3dc82c78f0fecff0f2e3b97d59c711584ca SHA-256: 5ea0fb6413d47294b41cd72eb912d09acfe94e92d0d039c19df568f8b63ec511
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary URL, 'https://traffking.ru/aws?keyword=1750+-+1800+american+history', and a Weebly-hosted PDF are prominent IOCs. The ML classifier strongly indicated maliciousness, suggesting the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffking.ru/aws?keyword=1750+-+1800+american+history PDF link annotation
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/zogopetej-xozarafugigu.pdfIn PDF document text
    • https://sidonakitipu.weebly.com/uploads/1/3/4/6/134631457/d9e34a.pdfIn PDF document text
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/lujin-nemes.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/201666f8-1c2b-4a54-8ef0-61b7388bb3be/92588312039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a44f2a-cf1c-4c4f-b8ff-0902b3b67686/alberto_casals_psiquiatra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27ae58e2-9dc4-49b2-abab-d90587500a8e/94256540934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14fbffa0-c438-40fb-a26d-dee5dc22738f/47021179293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9cc7584-aa96-4cca-b693-78831fda7700/40043046437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb75b6d8-8ec5-4669-b3d1-a5ec403c9a02/vojemajof.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/pirates_of_the_caribbean_elizabeth_father.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b875a7f9-23bf-484d-b286-a5c738651872/lesson_8.4_practice_a_geometry_answers_pages_480-487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/173d774d-4ecd-4d5f-9c7b-9b9400e996db/pineapple_fruit_dip.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_off00009313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9313 5640 bytes
SHA-256: b36671032df6b84ebf5c8309ed259313856b5d7f3c2800246d682385c977dc95
font_01_sfnt_off0000a634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA634 10740 bytes
SHA-256: 5a6451dc8dd3dbb6b3f9716e645ee645e1799e2709303f6b7af6984df679ae1a

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