Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5188c573a4f4d85…

MALICIOUS

PDF

78.5 KB Created: 2021-03-23 13:04:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 290388272564c20acae0a14fed2202da SHA-1: 493049aa571e44f5216878b1cd27064956d20185 SHA-256: c5188c573a4f4d85218a95f9c311766440865eafd483b37d85bd0d30dfb2d39b
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded URLs and the document's structure suggest a phishing attempt, likely to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

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://botokaw.ru/wix?keyword=task+force+2000+pressure+washer+troubleshooting PDF link annotation
    • https://cdn.sqhk.co/gevopobi/jJEEhgc/pesugozuwikinigofapeserub.pdfIn PDF document text
    • http://activa-fb.com/friedrich_nietzsche_a_nihilisthj5fi.pdfIn PDF document text
    • https://cdn.sqhk.co/lunemitibojo/ibvvPgi/73104331772.pdfIn PDF document text
    • https://cdn.sqhk.co/dojidavos/62ifhff/fogofexakuwudedivegov.pdfIn PDF document text
    • http://fashion-deals.xyz/building_great_sentences_exploring_the_writers_craft44jta.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/jgc2Whg/singapore_traffic_zig_zag_line.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_c6580c7e14d8431f81ad8d6b10b1b989.pdf?index=trueIn PDF document text
    • http://zatejufeg.rf.gd/1283264951.pdfIn PDF document text
    • http://fejolisevew.rf.gd/encryption_oracle_remediation_gpo_template.pdfIn PDF document text
    • https://a6047d18-b57f-4fdc-88fa-dea7715a8642.filesusr.com/ugd/189347_7ce83761200d4c0fbcdea05cae9bbe67.pdf?index=trueIn PDF document text
    • http://xumusemowujev.epizy.com/70010191898.pdfIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_76de799f417b4b838277e56bf7ebcc9c.pdf?index=trueIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_13eba73d35db4cf982651cd39bb6aa77.pdf?index=trueIn PDF document text
    • http://kujujigufa.epizy.com/mimakurumedoketoxixulux.pdfIn PDF document text
    • http://poferivinogaram.epizy.com/79896151582.pdfIn PDF document text
    • http://ravinod.rf.gd/motizumut.pdfIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_8afc1718af6e43079a62d7bdcec7f371.pdf?index=trueIn PDF document text
    • http://kuporalegumema.epizy.com/4816980538.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_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 5796 bytes
SHA-256: 1cb53d660591ea67d119041b49008ae3eb9fb1c5f3d991508146b77dd138ef41
font_01_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 11124 bytes
SHA-256: 2920bce9ff7030d13ce70bccd949be58da0221a7d351fc5326a1842a10c06a44

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