Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90c3af5219f6e92…

MALICIOUS

PDF

68.1 KB Created: 2020-11-13 20:06:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 12cd1d7284c8e4fb472b0403258b356e SHA-1: 170ec274e4096061f3615b86330d6a7d8cc2af18 SHA-256: f90c3af5219f6e92e18a09e8c33416e9196d7037b65d55b919fda194d27a43e2
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 0.9997

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/123?utm_term=17+year+anniversary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416923/normal_5f9d98be7ef67.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/lufojubelugitavosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f8751e8c190e.pdfIn PDF document text
    • https://pegepigav.weebly.com/uploads/1/3/4/4/134481067/3437cdd98a40.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/ponub.pdfIn PDF document text
    • https://sazoxizifa.weebly.com/uploads/1/3/4/5/134505384/04513.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/0f41d49f-91ea-469c-9865-a79ec361a5e3/94098701226.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/61141360430.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/opossum_tracks_in_snow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c2ee475-a033-4ac5-b4d5-3f6e2282f46b/zaguwefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df077e93-e950-470a-a77b-c3de08fa68a1/dolepasonoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4955ed53-4efc-40dd-bd53-8a998f0b15cd/69479200476.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_off0000cfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAC 4848 bytes
SHA-256: a769523647fb3ab11eeb38dcfb5c7d110f44e8f285523c150d81c16d8ad43b3e
font_01_sfnt_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 10468 bytes
SHA-256: 3cd3bb1c7f0f45d89044028c73180ad1c0275d2f9e1346969a635f432fc935b5