Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcec20cec3253f26…

MALICIOUS

PDF

69.0 KB Created: 2020-12-24 03:53:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9877af14887492d74b958af845284152 SHA-1: 60c54f7f9056208db298048e848e9efb6c7c451c SHA-256: fcec20cec3253f264057f8663dd01b865c58bc0f99f71413b183d94721347686
186 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffset.ru/strik?utm_term=drag+racing+wheels+for+sale PDF link annotation
    • https://sadoxeliwuduw.weebly.com/uploads/1/3/4/0/134040540/8214319.pdfIn PDF document text
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/dedopewuzepuzivalo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467586/normal_5fddf770d315b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_5f97c4cfc5d4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387419/normal_5fa83b8e0946d.pdfIn PDF document text
    • https://basuxebuj.weebly.com/uploads/1/3/1/3/131379820/xumaguzegitunu.pdfIn PDF document text
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/bibikifaxasunu_nukavakipezoga_derovexizetusen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464874/normal_5fd158d943573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450152/normal_5fbce4ab812da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_5fa8360fd3e0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_5f8b2c6468fb2.pdfIn PDF document text
    • https://pemezexuz.weebly.com/uploads/1/3/4/5/134585882/8b6231ef98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464707/normal_5fd86e5417463.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/bulujono/escheat_reporting_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11682765-ab7c-4633-adb2-f580f2ffe167/pewanefe.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_off0000cf2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2B 5232 bytes
SHA-256: ecc878becf0edea5b5fdc56089054e1ea4c2313d783bf5bd1dff6e41c854bc50
font_01_sfnt_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 10820 bytes
SHA-256: ef462f8cbb5c34fbab12cb3e92685a7c21b75b5eabf908a330e3a1bc49632af9