Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58a5437ac5df27a…

MALICIOUS

PDF

44.6 KB Created: 2020-11-07 02:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4feec4471b5e14e659b7461febc16c4e SHA-1: 9b54899e6cd8ba9f5af3dadb2bfb6cac4cf98ac6 SHA-256: b58a5437ac5df27a08d5d6a2ddaab4a536cea4a6094b5192ed52bf3c864ac364
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a significant number of external links, many of which are to benign-looking PDF files, but one link to "traffking.ru" is suspicious. The heuristic "PDF_SEO_LINK_FARM" indicates a large number of external links, suggesting a potential SEO manipulation or redirection tactic. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment that it is designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?keyword=digraphs+chart+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384152/normal_5f9621ec0c362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f88d0e216242.pdfIn PDF document text
    • https://mekivigabu.weebly.com/uploads/1/3/4/0/134096936/vorud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374685/normal_5f8dd121eb47c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392453/normal_5f97b4d38d84f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386334/normal_5f8d386047ea0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464302/normal_5fa23ac0d951d.pdfIn PDF document text
    • https://kaginugopaz.weebly.com/uploads/1/3/4/3/134310825/65c032cf7.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://uploads.strikinglycdn.com/files/b451f7a4-818b-4f12-ad82-1420ac4e0f00/fizemowevumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef78dce-4f66-476d-9583-ec78ff990264/word_whizzle_answers_political_leaders.pdfIn PDF document text
    • https://s3.amazonaws.com/xotorulu/31662807653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c9c813d-1d0e-4ab2-bc7b-a9011944b4ee/gusurirotiveto.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/universal_tv_remote_control_app_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad0db79-fb8f-4c36-9b13-bcb4adc87b22/45759911711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48160f0c-9892-44ed-9732-dd1f1cf29c19/xudunesimamitodemixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abc00b1-4bcf-4ed3-9ac1-89e87ef5c46d/bazugeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e12124be-5df5-4f75-bed5-32453f0a4965/94888866723.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_off00005fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB0 4840 bytes
SHA-256: fd1eada9d87bf3237eb60b1c8903ab5c0b65758baaa976ad854f00884f7235c7
font_01_sfnt_off00007039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7039 11128 bytes
SHA-256: d8ab258ca6b823358b8c9052f50cdc5df55f242d6edcef4c79ad7458ad818ef5
font_02_sfnt_off000095c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95C0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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