Malicious PDF — malware analysis report

Static analysis result for SHA-256 f539aeaf5651475c…

MALICIOUS

PDF

61.5 KB Created: 2020-12-05 19:31:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bba5d2220b111af9927bf527dbfc04e0 SHA-1: 97e6baeef79651c43f758153b72334c17536e10d SHA-256: f539aeaf5651475c7e49d8dd1929aec503a9eae0ad2f69fc6b9661e98a0b4b16
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 0.9996

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://traffset.ru/123?utm_term=bohemian+rhapsody+bass+tab+download PDF link annotation
    • https://zirenujunez.weebly.com/uploads/1/3/4/4/134431605/9781031.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366374/normal_5fc8c5e615f9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5f8cf0c3463eb.pdfIn PDF document text
    • https://bonubowagadeki.weebly.com/uploads/1/3/4/5/134506782/geredusowove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f8a191232395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_5fa7098d1877d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423460/normal_5f9e4261170d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/likerajatob/zatuvikev.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/54098893967.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/apple_airport_express_windows_software.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/74849043344.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/97878539163.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/android_auto_not_connecting_honda_accord.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_off0000b30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30A 5580 bytes
SHA-256: 5abc735abdeebddff4f3d56f01a8921ecdbf44ecc4adbd5776c96328ca9a938d
font_01_sfnt_off0000c5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E3 10628 bytes
SHA-256: 225b07fd5a4fe5b476d97250dd9006f92a948cc6ff66328d3c892a7a145dabd3

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