Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ae76eb3702962c…

MALICIOUS

PDF

78.6 KB Created: 2020-12-29 11:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 417a1da3b52288ae1822429a86c64f58 SHA-1: 1e694a5ef356a2005a2d26f77ad8cdaf536c2603 SHA-256: 31ae76eb3702962c465c3537404a3badcc58f62f242487f7e90de89e456f6b74
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://trafffi.ru/123?utm_term=banana+chocolate+chip+pancakes+bisquick PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427499/normal_5fe3e48216f0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415070/normal_5fdb6b1cc1db9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_5f9398a27ee63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_5fb3ec47d575a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459337/normal_5fdeb4a0d1cbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5fb6a0f0162be.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/hcibQif/roku_account_setup_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_5fbbee6656271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5fdc6ba3e814b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448720/normal_5fa2bb1fe0997.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/rovenixi_kududamiv_wixur_xinikax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467577/normal_5fbe915df309b.pdfIn PDF document text
    • https://ratanamiwul.weebly.com/uploads/1/3/4/3/134327333/supinufubitetob_rekutemugoban.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000decd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECD 5304 bytes
SHA-256: f3880e77edf9d2979de8ce95f5d45e746db3a01aa27431e4b6d47a6a0ea1f891
font_01_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 11252 bytes
SHA-256: 94edee488a36d78e67942d56172c37d8e2cf1be398ec274de51a9e8b940c0ef2
font_02_sfnt_off00011772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11772 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b

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