Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8db7feffa036d7d…

MALICIOUS

PDF

39.5 KB Created: 2020-11-09 11:45:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 53b16a90b748aa4bda3efa87f01d540d SHA-1: e36da9d2998885e00c8e09927593948470297f9b SHA-256: c8db7feffa036d7d426a5b66983f2f6df4755e3f9975e148361ef83f99df6f7d
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 embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. One of these links, 'https://traffine.ru/123?keyword=special+warranty+deed+in+a+texas+divorce', is directly visible in the document body. The presence of numerous links suggests an attempt to manipulate search engine results or redirect users to potentially malicious content. No scripts were extracted, but the structure indicates a link-farming or redirection attack.

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://traffine.ru/123?keyword=special+warranty+deed+in+a+texas+divorce PDF link annotation
    • https://simoreve.weebly.com/uploads/1/3/4/3/134370914/38f889ac4f78d39.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/sokilijaw.pdfIn PDF document text
    • https://pamuvomamutafa.weebly.com/uploads/1/3/4/3/134305197/2812039.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/3323574.pdfIn PDF document text
    • https://dowikonusinewe.weebly.com/uploads/1/3/4/3/134374018/6278777.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/1825e125-67f3-45d8-bb7c-ffbe516b9bf2/lijavo.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/fuvugusogujozuboba.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/21138380496.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/jesaxedof.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/stronghold_and_followers_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b5a5da4-e58b-4669-9b11-d295b17fa401/dr_seuss_character_costumes_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/behavioral_economics_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f87327-aff7-4b14-8653-850f50316cce/district_196_community_education_swim_lessons.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_off00005d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2B 5492 bytes
SHA-256: be58ebdb816548549a8741174a116943c63a2fd88837796af9e4e1706d3eb15e
font_01_sfnt_off00007004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7004 9700 bytes
SHA-256: 25bed9d58b0eca20376dcbc182b20e2e4bcdfdbe2eaee9d042145c2c7bad21a5

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