Malicious PDF — malware analysis report

Static analysis result for SHA-256 05016b802981b874…

MALICIOUS

PDF

44.1 KB Created: 2020-11-09 03:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2bf8575c8619fba948d08989868a857f SHA-1: 119df52171c1032df5f2189efdc1ea4db451a92b SHA-256: 05016b802981b874ffa7ebb4cd2cb1e130c23a7ad6bd754753fdec6006ac9e65
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://trafficel.ru/123?keyword=nexen+roadian+at+tire+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374188/normal_5f8ed7898974b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412767/normal_5f95bdd876d76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5f923b4f20c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463803/normal_5fa2d942be86a.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/cea40383-dea3-4642-bf20-6fe3383a21c7/how_to_pronounce_stella_artois.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03a52d46-badc-4aa1-b008-780210a63040/pubomimalopuju.pdfIn PDF document text
    • https://jasobegofur.files.wordpress.com/2020/11/46028857855.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/65645341474.pdfIn PDF document text
    • https://pozajifu.files.wordpress.com/2020/11/hyderabadi_chicken_dum_biryani_recipe_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/download_saint_seiya_awakening_mod_apk.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_off000061ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61ED 4588 bytes
SHA-256: c1fa6f7ac3959bd0985a1960aaf9e35529a1d5b50ea5e2443356d9a8c45ee3f5
font_01_sfnt_off00007197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7197 10440 bytes
SHA-256: 26f8984b4298d5d3fff2f71977e61a8e392d5cc924d4a37eddfb25fd4eda3691
font_02_sfnt_off00009572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9572 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34