Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa23224f9e35c34…

MALICIOUS

PDF

42.2 KB Created: 2020-04-02 08:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 01804bdde7090139a262cef15559b294 SHA-1: 7a107fdba23ddf09240105570843463207006e7b SHA-256: 5fa23224f9e35c34c65e3542ec16811342c8d870ea0bbf90d2091a9f21cf09d6
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 a method to distribute malicious content across many domains. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of outbound links points to a malicious intent, likely related to SEO manipulation or hosting further stages of an attack.

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://kylaconner.com/uploads/1/3/0/5/130541384/130541384.html#i+am+legend+sad+dog+scene
    • http://industryunlockedtv.com/uploads/1/3/0/7/130738913/wikirifokawiv.pdf
    • http://victoriahomeinspection.ca/uploads/1/3/0/5/130550768/9873258.pdf
    • http://straighterhead.com/uploads/1/3/1/0/131070926/1e8630.pdf
    • http://towingweston.com/uploads/1/3/0/9/130969657/41493.pdf
    • http://conocegoogleparaeducacion.com/uploads/1/3/0/2/130289282/93f2c8bb0d061.pdf
    • http://vanyonline.com/uploads/1/3/0/8/130874277/7084648.pdf
    • http://ppgreentnj1.com/uploads/1/3/0/6/130639685/finimu-gegugifizodow-dukosusewiwi-zawopurigaxi.pdf
    • http://badrep.info/uploads/1/3/0/5/130538959/74273128b.pdf
    • http://heidipaugutierrez.com/uploads/1/3/0/7/130775529/tivizeser_dawazateje_wofotaderidape.pdf
    • http://leylaismen.com/uploads/1/3/0/3/130379297/7207852.pdf
    • http://synfederation.net/uploads/1/3/0/4/130483647/xirudagoki.pdf
    • http://mieldercarelaw.com/uploads/1/3/0/7/130774965/391edb.pdf
    • http://gracelands.co/uploads/1/3/0/5/130590395/23f7221a4c80f2.pdf
    • http://glasgowchinese.org/uploads/1/3/0/4/130435666/d487e43dd.pdf
    • http://wholefamilycoverage.net/uploads/1/3/1/4/131410126/xakuwutipadu_dufami_famosuzuki.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_off00007941.bin
dc5d1116f867902145396fe88685021888c500d8b8109afd2f6db589e8f616e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7941 8612 bytes

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