Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07597a665813fb2…

MALICIOUS

PDF

70.4 KB Created: 2020-11-16 13:19:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fbafb8cc99bd97075f2f7cce8a4284d9 SHA-1: 203c64f63e792796d1d08b5f9321a6d57198a2e4 SHA-256: a07597a665813fb2dbbd41e7b66ff4e6ffb8655614aa1df588399264999fa405
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://trafffi.ru/strik?utm_term=radioactive+decay+half+life+problems PDF link annotation
    • https://letalisukom.weebly.com/uploads/1/3/4/3/134316231/5435082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460232/normal_5fa9b12b90847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384822/normal_5f94af295b801.pdfIn PDF document text
    • https://maxuvejalova.weebly.com/uploads/1/3/4/2/134265339/31337175f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417995/normal_5fa10caf2c06a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393898/normal_5fa1983097f72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5f9427f418110.pdfIn PDF document text
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/bijuloribo-tuvevomunalet-didozopoj.pdfIn PDF document text
    • https://natagudere.weebly.com/uploads/1/3/4/5/134526504/bomajor_wexob_rejobafumifozus.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/bikikanafopavu/28661218245.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/pimavevule.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/ibpsguide_hindu_vocabulary.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/5188603951.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/27226127703.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/book_design_ideas.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_off0000d2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 5704 bytes
SHA-256: 40c5aeb9f6a57d743d847b7859fbe1a837f3c7ec7b36c9612d2183f6e19d8564
font_01_sfnt_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 11364 bytes
SHA-256: f4ce9bb4af98adc60094a0a19a6a2309365508d2a3871352b8438906ada51c13