Malicious PDF — malware analysis report

Static analysis result for SHA-256 764c87c6fb138aea…

MALICIOUS

PDF

66.9 KB Created: 2020-12-19 09:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 49d16bb121b0e4e8e6e61af6ce48244a SHA-1: e65ed8bb72d36cf65e2bf1481a2a9eb482997fe2 SHA-256: 764c87c6fb138aeabf45b4cd178b5b563336b48cac5e45ecf31e991bc8a8c8bd
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 0.9998

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://traffnew.ru/123?utm_term=enigmatica+2+light+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5fd67ff82124e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5f89e6aeeae4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f90453384b34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481406/normal_5fa74ae079d18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500440/normal_5fb52553e02d9.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/sijuwoxujupid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d33eba-e9d9-4954-9a87-d064f1f6eb7c/nuxowigebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc0bde55-996c-4796-b47e-5afa6d77725a/plus_size_denim_skirts_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/dojosuwifexufasetu.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/faduwilizuwumetometuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/mitolekebune.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/football_manager_2018_manchester_united_team_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/437811358.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_off0000ca74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA74 5168 bytes
SHA-256: 922c844638902a6cf95cdce84cd0c086ee9472779fc789823fefec151f11696e
font_01_sfnt_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 10108 bytes
SHA-256: 451ac9e0fb19c4db8c266d1bb6c768d2f6aedc17ca67b0b6a7d8f83736d21cd1

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