Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7c44ecb5cba802…

MALICIOUS

PDF

46.0 KB Created: 2020-11-08 20:19:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 204802da48acdf0c7abb51384001f31a SHA-1: d5fcb31f75cd9dc9fcbc6595293ff40414c47ac3 SHA-256: 9c7c44ecb5cba80237a7ea95e69c476557ada59728067cc7d7c5c73de8a325fc
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://trafftec.ru/123?keyword=die+moritat+von+mackie+messer+lyrics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374380/normal_5f8f5b9f2181e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5f873dbd84925.pdfIn PDF document text
    • https://bedakowunuva.weebly.com/uploads/1/3/4/3/134342711/nunajuko.pdfIn PDF document text
    • https://pesegoniz.weebly.com/uploads/1/3/4/4/134497823/63ce0ce679.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/82067c34-7476-47e0-885a-e82c9eb7c9a6/namixipobanomuwesakuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/871520ed-f261-4f6e-935d-315cfe138a91/physics_kinematics_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7303ed38-8a98-4109-86c6-59fdb431ece5/a_dark_brown_dog.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/56248366096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9abe4e76-9f18-42af-84a7-a438773bc591/wugakiwali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cccd84c9-eaa8-4f1f-be18-474c805ea576/virtual_blood_type_lab_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc859b9-bc24-484d-b2bd-defa81ad12c3/90989165256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f16b99fc-3eaf-42b4-acb5-e09592c4d598/64027848997.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_off00007370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7370 5168 bytes
SHA-256: 4b83c46b75f0e71c460cccf96c76ff68fb5b0f5258ff11cddd41eb584a789353
font_01_sfnt_off00008501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8501 11708 bytes
SHA-256: df7b59e19417ff43be1fdf2e460f5808c37e21962cbedd460022bf004ae7b84d