Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62037275b538a0f…

MALICIOUS

PDF

63.3 KB Created: 2020-11-24 21:39:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9b1f1d35bfc240b72a12c10c1d30ef21 SHA-1: db91ccc912ec82c78ab245ce26b12c5dcaa273a2 SHA-256: d62037275b538a0ff7d317f4579c3acc2a3e5e8952c2f0d383e127ad80f9d5dd
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 0.9996

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/123?utm_term=exped+synmat+7+3d PDF link annotation
    • https://dapamokosow.weebly.com/uploads/1/3/4/3/134337633/7316663.pdfIn PDF document text
    • https://kopezemab.weebly.com/uploads/1/3/4/3/134339977/mipizod_debesikuto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401559/normal_5f96d4a7ad32f.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/045b66.pdfIn PDF document text
    • https://varavedonenen.weebly.com/uploads/1/3/4/3/134316352/3494834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378382/normal_5fb5faede1525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380882/normal_5f9a674822593.pdfIn PDF document text
    • https://mijelowiwiloz.weebly.com/uploads/1/3/1/1/131163856/5054441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422136/normal_5f9c5eeee8799.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/3266fb6c-70a6-4131-a068-aef0d59eef50/okunmas_gereken_501_kitap_indir.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_off0000bb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB99 5348 bytes
SHA-256: 1b0e8c5a6372e7fabf87c055b41552091f0efe09e89393d782a578aa981a5333
font_01_sfnt_off0000cdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD1 10212 bytes
SHA-256: 5a0f799ccc8444d23ddd4e4533b6cfe9ba1a970207f01710c55d779b6cb170b1