Malicious PDF — malware analysis report

Static analysis result for SHA-256 771cc99bf32cf405…

MALICIOUS

PDF

68.9 KB Created: 2020-11-16 16:56:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3787a1eed294d0c28bd1fbf77e5eb75d SHA-1: 92ffe350bad58952acf75419a917a9ba8c745139 SHA-256: 771cc99bf32cf405e8dc454a002cfb4a289ae2d8565e3b60c6ee500e956697b5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=tableau+de+conversion+surface PDF link annotation
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/ea2532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_5fa2a21455686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_5fa01b1ab14a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367923/normal_5f893327f404d.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/runazofil.pdfIn PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/nezake.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/faxowikuvupexadufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5f8dafd1271b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_5f8a131eefa17.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/0f9b510f-1742-4f97-a92b-75a6f6207c32/camping_screen_room_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/238b992f-a485-4be7-b223-d2bd8007e0c6/eagle_ridge_elementary_website.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_off0000c338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC338 4964 bytes
SHA-256: 238ac2b636061151993aa2786bbb3ea1214aa6d97ab117cdfe619382771ff068
font_01_sfnt_off0000d417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD417 10852 bytes
SHA-256: 229ec53ba411cb514ef3364de9becb0ad4eac2c906bcddb3655c1878a7fb75bc
font_02_sfnt_off0000f8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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