Malicious PDF — malware analysis report

Static analysis result for SHA-256 0020f4a2ddf1aed6…

MALICIOUS

PDF

53.7 KB Created: 2020-11-09 03:31:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4aeeda0522a91a776f105729aa14bc5 SHA-1: 584470abdd37c9ac92151e72b10ab92a88abc9e0 SHA-256: 0020f4a2ddf1aed64ee60cbb6ab961da765a0bea58cd56c92996c4729d3a3327
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation attempt. One of the embedded URLs, https://traffine.ru/123?keyword=clarion+m502+manual, is suspicious. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffine.ru/123?keyword=clarion+m502+manual
    • https://cdn-cms.f-static.net/uploads/4371248/normal_5f8c280457368.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://dolenukiwiwe.files.wordpress.com/2020/11/application_letter_for_bursary.pdf
    • https://wupomasaxo.files.wordpress.com/2020/11/nifazejimow.pdf
    • https://s3.amazonaws.com/mupukesunobaga/115391771.pdf
    • https://uploads.strikinglycdn.com/files/5ac25e0d-dac4-401e-a905-3661647f5514/dunolozos.pdf
    • https://pufelaneniw.files.wordpress.com/2020/11/35867518064.pdf
    • https://nevosaxovib.files.wordpress.com/2020/11/vuvemi.pdf
    • https://s3.amazonaws.com/wutezigojuxi/samsung_tv_model_un32eh4003fxza_parts.pdf
    • https://s3.amazonaws.com/jolufozo/black_friday_laptop_deals_reddit.pdf
    • https://jozonetiti.files.wordpress.com/2020/11/83403915446.pdf
    • https://s3.amazonaws.com/mexavofezoxi/tippmann_a5_sniper_review.pdf
    • https://uploads.strikinglycdn.com/files/12a2a3fa-7973-4a1c-a2f4-aabb859b1ac4/8958643420.pdf
    • https://s3.amazonaws.com/zuxadol/tamil_newspapers_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000842b.bin
db3c745cce452d5e22d2224d6da63ccc14315c46f36041137048599deb784951		 pdf-font-stream PDF embedded font (sfnt) at offset 0x842B 4760 bytes
font_01_sfnt_off0000942b.bin
735ec5fdd330429ed7cea1e547f627c68af23ddcc6ef6a6db55eee09cf0a1359		 pdf-font-stream PDF embedded font (sfnt) at offset 0x942B 11340 bytes
font_02_sfnt_off0000bae2.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE2 4324 bytes

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