Malicious PDF — malware analysis report

Static analysis result for SHA-256 32fab724f98463ac…

MALICIOUS

PDF

72.0 KB Created: 2021-01-11 23:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 13e56c9bf7f008c3184fe6bf3972d194 SHA-1: 1f4d81ab9eb3532264baac02e469254d460677af SHA-256: 32fab724f98463acf90b5825ab624a0395399c47047d5d26b0fd4f6424911bcb
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous external URLs, with at least one URL containing a 'utm_term' parameter suggesting a phishing or tracking lure. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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=louis+andriessen+workers+union+score PDF link annotation
    • https://wizugelavuri.weebly.com/uploads/1/3/5/3/135325487/3b80d9aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481052/normal_5fa94ad3b8a86.pdfIn PDF document text
    • https://site-1171591.mozfiles.com/files/1171591/32918727996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_5fdae0f437b17.pdfIn PDF document text
    • https://site-1175371.mozfiles.com/files/1175371/688484454.pdfIn PDF document text
    • https://cdn.sqhk.co/padirazemi/zEieK7Y/zasovu.pdfIn PDF document text
    • https://site-1238581.mozfiles.com/files/1238581/degaxofawimanibidigafezu.pdfIn PDF document text
    • https://site-1180426.mozfiles.com/files/1180426/xugep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379733/normal_5fc744b828690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383692/normal_5fb2b6dd87e29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428043/normal_5fcf6c8b3e9e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD035 4800 bytes
SHA-256: ad5ce35707840f8d4158264d30074e9beb4a2b420bb8a2f63fa1cefbb1996309
font_01_sfnt_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 10524 bytes
SHA-256: 0ab8679141944109262e6b60ef78078fca15162f134da75b07e63d11ab00cdac
font_02_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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