Malicious PDF — malware analysis report

Static analysis result for SHA-256 a731cfaed61ef95b…

MALICIOUS

PDF

66.4 KB Created: 2020-11-14 10:59:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 370c0a2b9adcb4ca6c19d178030473df SHA-1: 15c66058aee091ffc85cdf93a3df03288464619e SHA-256: a731cfaed61ef95b67caddf1bdd6aa0ce2d0b2dfeced1ab1f6172a3fdf1b5899
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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
  • 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.
  • 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://traffking.ru/strik?utm_term=chinna+chinna+aasai+song+mp3+free+do In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_5f87d92c124b2.pdfIn PDF document text
    • https://jowamevo.weebly.com/uploads/1/3/4/5/134511132/divaxagamusej.pdfIn PDF document text
    • https://jorogusanige.weebly.com/uploads/1/3/4/7/134715450/bufalada.pdfIn PDF document text
    • https://lupexepiw.weebly.com/uploads/1/3/4/3/134318885/9710673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_5f9f8f227bc77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413566/normal_5fa9ab5eee8cf.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/zaluxalurabusupati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417314/normal_5f96650bec56a.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/jumedemimo/chisel_honing_guide_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/chem_skills_worksheet_10_percent_error_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/rewur.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/township_hack_for_iphone.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_off0000c6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B1 5608 bytes
SHA-256: 472564c0e2533989f694ee2d6ce262c2578b2e7b93ed4828ce00af0fc8f7b852
font_01_sfnt_off0000d994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 10388 bytes
SHA-256: 9d215f19b368e0998b3253bde6f56d12ea6c9770ff734fe70fa305152064bf34

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