Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85ea80bec295ea0…

MALICIOUS

PDF

80.4 KB Created: 2021-03-20 19:19:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 08565be75cb794d7e101a8e56e9020a4 SHA-1: 07b209f7e532534069ccee51fb93de74336f48e8 SHA-256: a85ea80bec295ea0ef2e6077189f5e5dcf73e045886586f6028af5edd499d151
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs suggest the document's primary purpose is to redirect users to potentially harmful sites.

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 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.
  • 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://nipisod.ru/wix?keyword=sanheshun+fcc+mp3+player+manual PDF link annotation
    • http://xosubowavenu.mypressonline.com/3793871324.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379720/normal_6002181c6eec6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384464/normal_5ff222c24a97b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_5fe89dfb34b7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464078/normal_5ff8bd2798dbe.pdfIn PDF document text
    • http://zamowafa.mywebcommunity.org/18332471785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393364/normal_6054ab25b2eb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380070/normal_5ff576849586a.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/81972350666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_6017088737d1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_60512249ec4fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367912/normal_60017a2f3125a.pdfIn PDF document text
    • http://kuvezowepo.scienceontheweb.net/33276398688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_5fd3698c78fba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419412/normal_6022eaf9493ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_d2bfa3242d1c4b9582f5177ac7f95eaf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/jezefebelesibesugegigimuf.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/gafemisepe.pdfIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_4b1a41ea1c424ee987202093b42f8f75.pdf?index=trueIn 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_off0000fbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 5624 bytes
SHA-256: 2ffc6c15845577607c16a7e41ed8e30274dcb3ec9be0e98a11ae2c2b57aea445
font_01_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 10928 bytes
SHA-256: 59b8910490e8c38221c3972f4426765b54c8c1a93f36d4880587eee76b8be109

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