Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2e9cda80818fdf…

MALICIOUS

PDF

71.9 KB Created: 2020-12-06 22:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a8a465b1eb24011ab66d06aa1d76daa SHA-1: 721598ba46d6b6f7267310faf9c2a24a64e66086 SHA-256: bf2e9cda80818fdfb29e8a7e2e49450d72d57bc50e7d119b41b0084dfd449dcc
214 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one identified as a malicious redirector. This suggests the document is part of a link farm or phishing campaign designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/strik?utm_term=spark+plug+non+fouler+18mm
    • https://static.s123-cdn-static.com/uploads/4384471/normal_5fc9cb9750cb6.pdf
    • https://static.s123-cdn-static.com/uploads/4500183/normal_5fca1937736d0.pdf
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5f982a0aec9de.pdf
    • https://cdn-cms.f-static.net/uploads/4389599/normal_5f92d4bb361f9.pdf
    • https://jelalepoxona.weebly.com/uploads/1/3/4/9/134901657/tanox_nexulazatakopug_deposi_bozibenavaj.pdf
    • https://cdn-cms.f-static.net/uploads/4444114/normal_5fa1ee8a3c0c0.pdf
    • https://cdn-cms.f-static.net/uploads/4414682/normal_5f9bb853908bd.pdf
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f878c8b792b9.pdf
    • https://cdn-cms.f-static.net/uploads/4422135/normal_5f9add4dea748.pdf
    • https://cdn-cms.f-static.net/uploads/4386094/normal_5fb73f98ab132.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc368e8c6229360ecbce8a9/t/5fcbf5d674a40730fb832839/1607202262297/weather_radar_nc.pdf
    • https://static1.squarespace.com/static/5fc130cd8787e879896ddc20/t/5fc54727a97599144ea68229/1606764328280/fixer_upper_mysteries_books.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcfe.bin
16dbe0807fa3865ab288679cefcc2adf683fd857189fc77dba018fe50a80dbd1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 5456 bytes
font_01_sfnt_off0000ef88.bin
632b14f9b8821a30d1fd4d8aa7c0ae7d8e077c7ec49f693838a63493705cb831
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 10288 bytes