Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd85c875cb2eba44…

MALICIOUS

PDF

39.3 KB Created: 2020-11-07 18:28:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b1dfb340a37717e3df174a6492916b9a SHA-1: d56f984fcdb2a101c14bcb4149b2a14a70b12e08 SHA-256: fd85c875cb2eba44ec2e6d54531e761e7de88550193ca307712825c25a29fa2b
66 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=health+safety+and+nutrition+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368969/normal_5f97717127f9e.pdfIn PDF document text
    • https://buxiniti.weebly.com/uploads/1/3/4/3/134309366/kulebilobutulox_pisowewi_vokaragatigibot_sepetukinewidaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_5fa1e00c5b7d3.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/12456c2.pdfIn PDF document text
    • https://vobemebu.weebly.com/uploads/1/3/4/3/134383317/dudikemat.pdfIn PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/6407459.pdfIn PDF document text
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/b95866.pdfIn PDF document text
    • https://bagolisenavela.weebly.com/uploads/1/3/4/4/134496394/xotazuxifiwuxaliluw.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/kulinisokakewi/11868917633.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/38459723386.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_off00005998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5998 5232 bytes
SHA-256: bc51c922f9808b1614011da3db12bb109bdde0d755993f8f7ba82822ed050c00
font_01_sfnt_off00006b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B65 10460 bytes
SHA-256: 4740212e710c60f1a5a8e5236d22fd3ec7db00f90d70afc111be556d91fc9ea1