Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f643028e6a44932…

MALICIOUS

PDF

33.7 KB Created: 2020-04-24 02:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 369049e2238299a8b3a924d06694de0c SHA-1: b63c1d0ef823ebf669b68162115e466c6bd2264a SHA-256: 9f643028e6a44932154da735eb2600b136012d1b5ba09bb8416f63c0916bddf3
94 Risk Score

Malware Insights

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

The PDF contains numerous external links to other PDF files hosted on various domains, indicative of a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains a title related to nursing uniforms, likely a lure to attract clicks to the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://deceptivelysimple.com/uploads/1/3/0/5/130551378/130551378.html#que+significa+el+uniforme+de+enfermeria+pdf
    • http://iamsoundandvideo.net/uploads/1/3/0/4/130488983/2530047.pdf
    • http://awjdesigns.com/uploads/1/3/0/8/130813851/jomizikusif.pdf
    • http://cornerstoneauto.net/uploads/1/3/0/6/130639842/xatikeduzo.pdf
    • http://mmisini.com/uploads/1/3/1/6/131636807/a75ca.pdf
    • http://coldicezero.com/uploads/1/3/0/6/130604630/c448a.pdf
    • http://automatedsalesrocket.com/uploads/1/3/0/6/130639626/e4016407.pdf
    • http://lunchatcdc.com/uploads/1/3/0/8/130874671/viravimab-sidurudetalu.pdf
    • http://prepintime.com/uploads/1/3/1/1/131163747/2782777.pdf
    • http://incognitam.com/uploads/1/3/1/0/131070336/f1442d5d0aa09.pdf
    • http://parkviewcafe.net/uploads/1/3/0/5/130590054/9363072.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_off00005d84.bin
0e1e30d18cc2d4714b730ce441c483f134380751367dea999272958eef4519a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D84 7432 bytes

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