Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47170f5c9aac054…

MALICIOUS

PDF

72.4 KB Created: 2021-03-17 06:09:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fc8ee61647e26a52e510cce1073abb3c SHA-1: e53623d34fc7782b2d34d831f72e2c80b4eb23c6 SHA-256: b47170f5c9aac05402b5074c7c544f1327e70de440a2f7882a4f161dfaccf8f5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely aiming to redirect users to potentially harmful content.

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
  • 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.
  • 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://zajinet.ru/123?utm_term=barrena+helicoidal+manual PDF link annotation
    • https://zutupowetor.weebly.com/uploads/1/3/5/3/135350992/varamorijoxunu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495039/normal_60088a9891970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487631/normal_5fe6788d8aee9.pdfIn PDF document text
    • http://rotawafuwuno.scienceontheweb.net/74154002353.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/478235.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/anxiety_workbook_cbt.pdfIn PDF document text
    • https://fezagigix.weebly.com/uploads/1/3/0/8/130813643/323026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_602a79be985cc.pdfIn PDF document text
    • http://bowoporoj.iblogger.org/open_ended_formal_audience_analysis_survey.pdfIn PDF document text
    • https://kumakisatosoref.weebly.com/uploads/1/3/5/3/135328720/316cf4.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/712212.pdfIn PDF document text
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/vavikenetuvemujad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_56c087c072e64cd8bd825233a71d30ca.pdf?index=trueIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_894d3bf0fd6e4424b543fc6e54d42f0c.pdf?index=trueIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_777240e48ad441549523208cfdb529c8.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_2e23935b65534ce3805247270dad8d56.pdf?index=trueIn PDF document text
    • http://zivonupawidam.atwebpages.com/13217240173.pdfIn PDF document text
    • http://dakiwadizadenig.rf.gd/back_to_eden_book_free_download.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_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 5048 bytes
SHA-256: 42fe902e819e7b709f3611147dfedab71c8cc79eb0ef1fce3e73660c7c13425e
font_01_sfnt_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 11836 bytes
SHA-256: fdac108d49250e8f594fe3fd356ad63454bedbdf77188f1115e862b42d7e535d