Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f52b3bb81983a32…

MALICIOUS

PDF

67.0 KB Created: 2021-02-15 02:21:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8e9156df984219cf0986e61ec9d69d71 SHA-1: 63aeecc19f9775be15b9039522bd15d21e0a350f SHA-256: 9f52b3bb81983a32d783561825d8b1e434f95da3578cfa2bb402525d4dec5fe0
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/wb?keyword=anti%20theft%20alarm%20project%20report PDF link annotation
    • https://sefaxamijewosaw.weebly.com/uploads/1/3/2/6/132682716/1933421.pdfIn PDF document text
    • http://kipigonatusa.iblogger.org/checking_information_on_smartphone.pdfIn PDF document text
    • https://wosiwimobej.weebly.com/uploads/1/3/1/1/131164223/7876318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_6010ca54cf1c9.pdfIn PDF document text
    • http://vandify.com/skype_mobile_video_callf7oz6.pdfIn PDF document text
    • http://fruit-ital.space/sikesubowawosakuzjh7dj.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/63966228302b8t95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418981/normal_5fd8ee771a981.pdfIn PDF document text
    • http://wekeb.space/49510281363s5ky8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419204/normal_600cde04d01ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kevowuju.rf.gd/news_intro_after_effects_templates.pdfIn PDF document text
    • http://sawutekoxa.epizy.com/gonumewojip.pdfIn PDF document text
    • http://jeloneliva.epizy.com/dewetowuj.pdfIn PDF document text
    • http://mijikudetixo.epizy.com/abhishek_name_video.pdfIn PDF document text
    • http://kijibabekisuni.epizy.com/excel_vba_protect_unprotect_all_sheets.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_off0000cac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC9 5140 bytes
SHA-256: 85e3cbc54b301a08af7dedb663f81d1d5376b7ceb640fb0c46473ffce1d7949e
font_01_sfnt_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 10220 bytes
SHA-256: 5a6bb1ef063b6b5f426d196af8cc6a381a19692d98bcaa28a579f2a01bfc6887

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