Malicious PDF — malware analysis report

Static analysis result for SHA-256 4785fcf5eab09a6a…

MALICIOUS

PDF

83.9 KB Created: 2020-11-18 05:02:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3d6ed9e6c52328362b978619d456f358 SHA-1: 1e7162e8967617e37050b9553c96b8a48e46e240 SHA-256: 4785fcf5eab09a6a9347fa1ec429953fbc4fe6e70d299e2283b6851cac9f6fac
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffnew.ru/123?utm_term=state+plane+coordinate+system+zones+map PDF link annotation
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/960b96b0e.pdfIn PDF document text
    • https://voganolov.weebly.com/uploads/1/3/4/3/134372868/5179466.pdfIn PDF document text
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/tapalisizemef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457561/normal_5fa35278e5e32.pdfIn PDF document text
    • https://buvejigu.weebly.com/uploads/1/3/4/3/134386374/4304288.pdfIn PDF document text
    • https://sapakokejepudig.weebly.com/uploads/1/3/4/4/134457578/kivekaradakela-pisolixuxefe.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/c4d2b6f7-8e04-41b3-a831-5962235205e6/fundamentals_of_corporate_finance_be.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a689a225-42b9-4093-b4ec-52bfb63f3e50/equinox_bloomfield_hills_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0527739a-3bb1-4387-a4c2-501f1f35d310/vumikosubuwabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b459bf90-f857-458a-84b6-5207b94773fd/jovopizajiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6122d82d-85b2-44e8-860c-7c564e8f3ed1/migezuxike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be250e62-a54d-4554-9699-901408fd9abb/81196028984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbfc634a-0114-435b-b165-8554580f8a25/statistical_studies_statistical_investigations_margin_of_error.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/35190016247.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_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 5476 bytes
SHA-256: 5b554f300aa3ec89cfda790cc1b3f9cb3eacb90f2995114adae636c0d5fc4f75
font_01_sfnt_off00011d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0F 11108 bytes
SHA-256: ecfc1548d0be26b2e1e2119af5a8f146d42d2b70a8314332b0b05c76c1d6aecb

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