Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3a785bad2ec721…

MALICIOUS

PDF

60.8 KB Created: 2020-12-02 08:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: bcc854e0e17c0a9d91d971359119c504 SHA-1: 4bc08ec3f6a3159bc3e65c9075354e73d3641856 SHA-256: 2d3a785bad2ec7213df251e36a936e388a536eeb04f906c25f6cc378bbe35cda
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which are likely part of a link farm or SEO spam campaign. The document body, though heavily obfuscated, suggests a lure related to a product manual. The presence of numerous external URIs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/123?utm_term=delonghi+safeheat+comfortemp+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5f880ab7e8e46.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/tamabawolalul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467036/normal_5fc72408ddc63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f8bc50e6aa63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5f9fffc406dc2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/dos_command_to_list_files_in_folder.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3760ea5bc066edfb5e588/t/5fc6fcce93ad1a4812101281/1606876368156/monster_high_venus_mcflytrap_parents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cd2f94f-c41c-4a78-8fde-c84e176ff5bf/guava_lotus_fitted_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa09ba80-19e3-488a-8618-f0f5092f3f8c/47349543270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4cc5b6d-836e-405f-8918-98dd54df5034/wigizuwovivutoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a3552d-3853-43f2-871b-e0275e30c437/mywhirlpool._com_employee_portal.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d52e3dfdd95b60d4bb65/t/5fc2abc1bc819f1cf4300be7/1606593476018/skam_france_season_3_episode_2_piano_song.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/dozex.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_off0000b0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DA 5428 bytes
SHA-256: b97d19a8f04cee880147ab20feef6493ee18e8b49e0dad81fd5180859c79b8aa
font_01_sfnt_off0000c331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC331 9912 bytes
SHA-256: 5bb522e227b10c076e7527e69b3b5b46387f71cdfeaa8fc92a86de2533d1483e

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