Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d56656c01c615c…

MALICIOUS

PDF

37.5 KB Created: 2020-11-08 13:57:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b5e7fdf29232a6e30d3c88a57851faae SHA-1: 2a6a59be1fc9e817b77b4e34a8a624c7cbe2f484 SHA-256: c7d56656c01c615c0eb82bba79e7eaf2b407c5782258e3d4b4fbba753ccbb339
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffset.ru/aws?keyword=three+steps+above+heaven+2010+trailer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414515/normal_5f970573d9339.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/b25b27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449205/normal_5fa2ea7ae9b95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f971a99042f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5f8a9e9914502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_5f911b3f107c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393503/normal_5fa1257383753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461204/normal_5fa48d1dd4b18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_5f909bc189205.pdfIn PDF document text
    • https://sofowalomutupal.weebly.com/uploads/1/3/4/3/134310420/23d5ae94f987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389824/normal_5fa09c67524a2.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/tubupejevomo/midpoint_and_distance_worksheets_kuta.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/engineering_drawing_text_book_by_nd_bhatt.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/can_you_add_a_hyperlink_in_illustrator.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/eldest_free.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_off00004ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EA5 5380 bytes
SHA-256: 08793ae3a44d845a6d9ad5be7ffa9a71bbf9c7fd2abfc8dd476b5f256e127a57
font_01_sfnt_off000060ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60ED 11628 bytes
SHA-256: 4aa046c179956abfd4cbf6180075bc8a3a7b72629a40999681ee71f6a91d54ba