Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3faea47f1cbc43…

MALICIOUS

PDF

77.1 KB Created: 2021-06-12 03:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 64aac994c116a73bff6069522608d09d SHA-1: cda1aaa180f095b6e39b309fe00241170508bf7d SHA-256: fb3faea47f1cbc4312baa419df5ceef241b627f6df0bc11401845337fb16800e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document's primary purpose is to drive traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crewmak.ru/pbw?utm_term=best+health+potions+skyrim PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376856/normal_60be72207bca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_603d3f5179f51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_601b670241d64.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4403262/normal_60b4b1662fb7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_601d7b825bf53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391024/normal_60028a55cd0aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_602ac4c96cac1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454967/normal_6024b7f53436c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407084/normal_603742a61d231.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458621/normal_5fef108c3dab2.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4461249/normal_60b65939eca95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387242/normal_5fd76f9f9ff22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484355/normal_5ff2d6de510db.pdfIn PDF document text
    • https://rirakivu.weebly.com/uploads/1/3/5/3/135333056/pejomedu_vafipogaduxi_bugoforafeb.pdfIn PDF document text
    • https://nusesosof.weebly.com/uploads/1/3/5/2/135296084/bosidi_rifanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_60175f3306c3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409806/normal_60512821d1bc0.pdfIn PDF document text
    • https://tamoxukezoge.weebly.com/uploads/1/3/4/5/134585929/8843817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_601ce12622775.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380070/normal_5fde1f9d48778.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2dd7ccc3-0539-4314-84be-9bb4da337699/76172666096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b17e98ea-bfeb-42c4-972e-cd71c6ca2dd0/1255616639.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 5060 bytes
SHA-256: 185187b01f97a58f36dff9b70dd52c772aaba8c68b67a14b9b7cd8815b47488b
font_01_sfnt_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 10220 bytes
SHA-256: 34702027949251ea99e5755f044f8d8fac2017706b7f1268389b191de66494e5
font_02_sfnt_off000118bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BD 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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