Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fb0ccd86b9c0b6…

MALICIOUS

PDF

75.9 KB Created: 2020-12-27 19:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b25710132a05a087fe84f18b7bc7ad25 SHA-1: 2d0f648c9ec351986d2dfafa936fd6fd1b8dd389 SHA-256: f4fb0ccd86b9c0b6c2eca7aed5e2da3c3671f2ce6e69f31fbfae591899e069b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and 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 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/aws?utm_term=caregiver+stress+and+burnout+pdf PDF link annotation
    • https://depumubawaminuk.weebly.com/uploads/1/3/4/2/134236244/lakuxivu_pugeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_5f9811700fcfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_5fb2c10ea6993.pdfIn PDF document text
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/adf8452b2837.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383917/normal_5fe273d70dae8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_5f8d38bc4784d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487431/normal_5fc42892db2c5.pdfIn PDF document text
    • https://zusikoxapumobib.weebly.com/uploads/1/3/4/7/134766975/werawojujele_xaseromedov.pdfIn PDF document text
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/0c787c37b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365576/normal_5fcd1d3a5dd14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470985/normal_5fd78413ccac8.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/99261df2-5df7-4a7d-857d-76506ed6fb70/norn_dichotomous_key_worksheet_answers.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_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 5284 bytes
SHA-256: ffa78198189ee5c027bf97661481bc71003c94a593376ec3dbe531f60a49cdf9
font_01_sfnt_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 10424 bytes
SHA-256: ea58c18c241beb0b341dd778d4f70710c6c1326ad32e26c92665c3fe967b10fe