Malicious PDF — malware analysis report

Static analysis result for SHA-256 784aacc64b3e23bb…

MALICIOUS

PDF

53.1 KB Created: 2020-04-01 21:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4d3f893eaeae0aa9a989cc1ad68a866b SHA-1: 7a0977d2174f25d59546d40e8a847446419632bb SHA-256: 784aacc64b3e23bb38d17ad1fdd18b885366e396093a584ca647f72b9dc4b518
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the embedded URLs are the primary indicators of malicious intent, likely leading to further malicious content or phishing pages.

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://xueqisong.space/uploads/1/3/1/4/131454207/131454207.html#minimalism+live+a+meaningful+life+pdf
    • http://kadilynnco.com/uploads/1/3/0/3/130379061/mawukiwore-xapero-xixisajatevatuj-joxekemowig.pdf
    • http://nickmarsh.online/uploads/1/3/0/9/130969148/wemavusesov.pdf
    • http://jtftoday.com/uploads/1/3/0/5/130541346/44e1ae4312f6512.pdf
    • http://shenprayer.club/uploads/1/3/0/4/130489437/fe0bf1cc10.pdf
    • http://shabechildcarecenter.com/uploads/1/3/0/4/130489465/313377.pdf
    • http://janaelindenportfolio.com/uploads/1/3/0/3/130379461/32c647402866c6.pdf
    • http://merchantkarma.com/uploads/1/3/0/4/130478174/5558360.pdf
    • http://melissaamiller.com/uploads/1/3/0/7/130739253/rujutuka.pdf
    • http://cultureshockwebly.com/uploads/1/3/1/3/131398279/lubowo.pdf
    • http://hostmaster.swimbridgepreschool.com/uploads/1/3/0/8/130813787/gedarob_geruba_gegena.pdf
    • http://blgservices.net/uploads/1/3/0/6/130604466/wutezujiw.pdf
    • http://deltabravoconsulting.com/uploads/1/3/0/7/130776083/31c471.pdf
    • http://livinganewwellnessctr.com/uploads/1/3/0/4/130483158/nugimikefub-lapewu-gasemijaxu.pdf
    • http://bmcomput.com/uploads/1/3/0/3/130323332/c689f.pdf
    • http://gel-nagellack.com/uploads/1/3/0/6/130604956/6078228.pdf
    • http://my-link-online.com/uploads/1/3/1/1/131164120/3924871.pdf
    • http://mymasterstreasures.com/uploads/1/3/1/3/131383553/6633395.pdf
    • http://beautifultexas.net/uploads/1/3/1/0/131070456/4401466.pdf
    • http://fricksfix.com/uploads/1/3/0/8/130814931/3350898.pdf
    • http://sixtoto.com/uploads/1/3/0/4/130488157/1124888.pdf
    • http://ridingmindfully.com/uploads/1/3/0/5/130544295/1493f66.pdf
    • http://foto-en-zo.org/uploads/1/3/1/0/131070518/ff18dd91c521fc2.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000906f.bin
e3f56b2ad4b39d13394315dc885ffb1d38b3d40b531c0072167cadbd4437e32e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x906F 7944 bytes
font_01_sfnt_off0000af64.bin
c6c28444bcd94379862b6cc7f8cfcdbcdaeb026857ccdb099d87626a561054a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF64 16092 bytes

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