Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf643e5d46f0416…

MALICIOUS

PDF

65.8 KB Created: 2020-11-14 18:42:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dc912d1386506802408f06b05a9c8a9a SHA-1: d83d9e5d2d524fbd92909a2245b2cdcb68b63204 SHA-256: bbf643e5d46f0416a13af8db30499a75622613d9a322e63fcad12174dbf77558
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 0.9998

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/strik?utm_term=hydraulics+training+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f8724e64ec0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f9b2ccd3c85f.pdfIn PDF document text
    • https://niwewuvikade.weebly.com/uploads/1/3/4/6/134629185/mitizixojufuwaweda.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/gupumeged.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402711/normal_5f9e342b4d532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5f8b6043a7fb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5f92647c87acb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_5f8fc8d94a5e2.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/e9484a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_5faa154bb45d1.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/fajufesovefiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5fa39b886eea2.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/fovezewi/genital_jousting_game_ps4.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_off0000c674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC674 5536 bytes
SHA-256: 1360a039b1994ac1c4e18c3d4740e9a915a8dc65ab077ea7e3dfb8ca2a64b0f6
font_01_sfnt_off0000d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 9852 bytes
SHA-256: babe204e1fd6cd5f3579cc1a99a137f1e24f1dac1bbe01de4244e7765602c3f2