Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f3b7bf00231c1b…

MALICIOUS

PDF

69.4 KB Created: 2020-11-26 09:37:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 77427e7d77e7cd75d2536aaabf1868e2 SHA-1: d8fc57801036c2843e4ec0f80c79ae9ae2840639 SHA-256: d2f3b7bf00231c1b5481f5fa8aa1d2b549aca38a85f193ccc5f91a6fd05b861d
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://traffking.ru/strik?utm_term=comcast+channel+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449974/normal_5f9e730bee322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445888/normal_5f9f98d399c41.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/girofotud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_5fb294018aab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5fa5f65072876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490125/normal_5fba767e78d44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376609/normal_5fa25a8c23017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_5fbebe22ad5cb.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/liluvad/xozotopajuzejowamabo.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/67725141948.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/clinician_s_thesaurus.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/wesevudizawomo.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/low_dropout_voltage_regulator_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/mitadozo.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_off0000d152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD152 5376 bytes
SHA-256: 2f9ecb59f3269bde7bf9b6d8f80a3fa5a8c1f22e2ac82a9dcd649f4547abfb5b
font_01_sfnt_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 10980 bytes
SHA-256: 73dbbb6805bd11946737f1c21e65f3cc9d714f1a74e48d2eebdb14279f64c203