Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2e4df77e594074…

MALICIOUS

PDF

73.0 KB Created: 2020-12-29 12:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fa60ead580dc81f8858508f202814873 SHA-1: 475aabba07bdd57841b38a3dcd523d59a4b62e84 SHA-256: 1b2e4df77e5940741efe073f47d85c48fec9fcd32269d5629aa916a777822d9c
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV also detecting it as Pdf.Phishing.Trojan. The file contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/strik. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Real steel robots', suggesting a potential lure or theme for the malicious links.

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
  • 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.
  • 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.
  • 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://cctraff.ru/strik?utm_term=real+steel+robots In PDF document text
    • https://tudekazesabi.weebly.com/uploads/1/3/4/3/134367585/xeluvuzutupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409998/normal_5fd122edde87c.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/34612d8315b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418968/normal_5fbcf4c73333d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416144/normal_5fc3580a0d5c3.pdfIn PDF document text
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/zobulanonodekatuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5f9b60db6d175.pdfIn PDF document text
    • https://zavomafig.weebly.com/uploads/1/3/4/3/134356936/2b2fb27b121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460232/normal_5faab7dcca871.pdfIn PDF document text
    • https://vizakadaji.weebly.com/uploads/1/3/4/4/134491897/tiranaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449599/normal_5fb323eecec91.pdfIn PDF document text
    • https://tagopebarezixog.weebly.com/uploads/1/3/1/6/131607889/0825f460.pdfIn PDF document text
    • https://vapojulugib.weebly.com/uploads/1/3/4/6/134669528/19c20376dd4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489054/normal_5fe852e87c9a8.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/vizegemawokaxe/vufuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b628c2a-17e4-4789-8caf-e96f866d5515/62057785270.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/8854351730.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_off0000e20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 4824 bytes
SHA-256: 3100ff3494e48e127ce1220751d142719e9e55094aac1b10ccea63727fa78bb3
font_01_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 10940 bytes
SHA-256: c782232ecd90ca13a1687286a73edfb20ee20ae9502bf95a8b244fa9877e885e

Open this report in the interactive analyzer, or submit your own file for analysis.