Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3e049678430017…

MALICIOUS

PDF

39.9 KB Created: 2020-04-09 07:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e48d91131c70aa4be735bbe77f74303a SHA-1: 654a9a50aade74ac759e14ac47ca5075e12a949a SHA-256: df3e0496784300179c36d2e96937c5fa794ebe4fc3ceaa91908abcb35e005048
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links to other PDF documents hosted on various domains, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body itself is largely obfuscated but contains a reference to the URL http://jewels-hair-studio.com/uploads/1/3/1/4/131437619/131437619.html#frases+de+aniversario+de+bodas+religiosas, which is also present in the extracted URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://jewels-hair-studio.com/uploads/1/3/1/4/131437619/131437619.html#frases+de+aniversario+de+bodas+religiosas
    • http://faircap.loans/uploads/1/3/0/4/130435990/7388770.pdf
    • http://mrbcontructionllc.com/uploads/1/3/1/4/131453861/jenilevutow-zajonisifes-lajuvagupig.pdf
    • http://bienchulas.com/uploads/1/3/0/2/130289670/zefopanosan-sofutos-mubixiliwedu.pdf
    • http://bestcheaptrips.net/uploads/1/3/1/4/131407111/penowivetekune-tunawekusuwex-nupepemi.pdf
    • http://missbrunosclassroom.com/uploads/1/3/0/5/130551247/aa6b243cee43.pdf
    • http://languageontheisland.com/uploads/1/3/0/3/130313309/laxowexakulubig.pdf
    • http://melaniesnaturalsoapco.com/uploads/1/3/1/4/131482882/xabaton.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006917.bin
a15d312cc3b7c3a9fffe18754b61eefa886568587402d9a9b5f5d8c0adb0ca54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6917 8592 bytes
font_01_sfnt_off0000886b.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x886B 1708 bytes

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