Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95173c6b1a17349…

MALICIOUS

PDF

73.4 KB Created: 2021-02-26 03:21:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e59ead9a85d034523d8fad832444c2f8 SHA-1: 8ac7a8bfb53bfcfc7444e8845a187e43f76aeaf0 SHA-256: d95173c6b1a173490ec052f29110bc0b1584c9551ca2ba1efd57a381263a6415
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=wii+u+loadiine+games+to+wup PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454673/normal_60204acb4e849.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/penosoxixazejoridub.pdfIn PDF document text
    • http://terasivox.22web.org/vemizabemoz.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/must_watch_anime_series_all_time.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/warof.pdfIn PDF document text
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/terotazubixetelej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_5fd3aacb7b69b.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/32543298974.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/43226274263.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459483/normal_5fc5a310cd272.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426270/normal_5fe12abfa3042.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468270/normal_5ff59a4284b89.pdfIn PDF document text
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/befazuwififirokamu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406514/normal_5fc6a68c10a0c.pdfIn PDF document text
    • https://gejowarog.weebly.com/uploads/1/3/2/7/132740172/5866509.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bifovigavij.myartsonline.com/honeywell_smart_thermostat_not_working.pdfIn PDF document text
    • http://vemixizafij.rf.gd/26346477241.pdfIn PDF document text
    • http://jokipuzovorije.epizy.com/arkansas_mandated_reporter_training.pdfIn PDF document text
    • http://kuxomexepus.epizy.com/58541129228.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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 5288 bytes
SHA-256: 29303124c92cb6b8a0504cdb240d63866aea177db6cce683a489f6649865d8f8
font_01_sfnt_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 10136 bytes
SHA-256: 2cdcd5a2a3a376a43730988e0d72e9c21a8e6152651ee9dca9138eb46d8220dc

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