Malicious PDF — malware analysis report

Static analysis result for SHA-256 45525058ffe798a9…

MALICIOUS

PDF

70.5 KB Created: 2020-11-28 06:39:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f296470029a655a506cdc9e6e116793a SHA-1: dae6684286981d8ca700c54d155ead89ce07470d SHA-256: 45525058ffe798a9fe897860329221b4dc6cc552e24b3fb90614ccd7a75388da
156 Risk Score

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=jokes+for+adults+clean PDF link annotation
    • https://zexenokupilifuw.weebly.com/uploads/1/3/4/3/134375928/pajotaliweboli-lazukupug.pdfIn PDF document text
    • https://mifuvepezomiluf.weebly.com/uploads/1/3/4/3/134312517/rowedalomepitevir.pdfIn PDF document text
    • https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/5830667.pdfIn PDF document text
    • https://tulalezosisab.weebly.com/uploads/1/3/4/6/134601470/8294332.pdfIn PDF document text
    • https://bamegipizof.weebly.com/uploads/1/3/4/6/134647446/3882243.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/9165004.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/nanatiju-kewisakedukukeb-bejesore.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/tetofamuxulil/76069134287.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/80285059054.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/12458414016.pdfIn PDF document text
    • https://s3.amazonaws.com/texifaxepag/87208100469.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_off0000d7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A4 5068 bytes
SHA-256: 4447cd0f72c227ffa93765fddeb975ccfa5cecc26b8d30f45f97161a39cc0f64
font_01_sfnt_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 10984 bytes
SHA-256: 9a536529f92f0054152bf285e7eb5f6f318fd6b6a545574ea6bc0bbf9df13f91

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