Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca042e1640555ad…

MALICIOUS

PDF

39.6 KB Created: 2020-04-09 07:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f69dd0431686d8c0b54688ab4af6b398 SHA-1: 7c605fcaed00760ff376e1ba79da1dc4900e022e SHA-256: aca042e1640555adf6928c5edbd2247ed601540b6d4f63fcd0c0553ca9141210
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a significant number of external links, a technique often used to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious. The presence of numerous URLs suggests a link farm designed to distribute malware or conduct phishing attacks. No scripts were extracted from this sample.

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 http://fancynancyshousecleaning.com/uploads/1/3/0/5/130540178/130540178.html#historia+biblica+de+ester+para+ni%C3%B1os
    • http://quillandtypewriter.com/uploads/1/3/0/9/130969449/wusofanumagik.pdf
    • http://dasrausa.org/uploads/1/3/0/5/130541208/xegelevinevirib_bivaxemovisirux_jafoxusu_lexuseb.pdf
    • http://sweetstuffbake.shop/uploads/1/3/0/6/130604725/9608484.pdf
    • http://allfoodsafety.net/uploads/1/3/0/8/130814017/57e84.pdf
    • http://snz-gloves.com/uploads/1/3/0/3/130313262/50ac09bc.pdf
    • http://sonbogugallery.com/uploads/1/3/0/8/130874292/fugedoxenop_deludenide.pdf
    • http://southeastasiastrategies.com/uploads/1/3/0/2/130291689/89be7f09.pdf
    • http://dedicated2education.com/uploads/1/3/0/7/130776249/8a3c9cf7.pdf
    • http://bridgethemedigap.com/uploads/1/3/0/6/130621051/6864922.pdf
    • http://getassuredins.com/uploads/1/3/0/6/130605335/2887685.pdf
    • http://jazzyslimesuk.com/uploads/1/3/0/9/130969478/nupoxetivuzewakagu.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fef.bin
b77ada37cd5b6c74a889b6c8400989d10d401ad46304f8d9aac7df29a4c7cb8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEF 8652 bytes

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