Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb757db91d4f2f6…

MALICIOUS

PDF

36.4 KB Created: 2020-03-08 10:07:06 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e8072bc57de89a331d5ebc573903486c SHA-1: a235003613959b1998aef957b94d09624886c43b SHA-256: 6fb757db91d4f2f64cfa39d0db2b2da5b4eaa52b7a739ba7dd770f50346e4968
96 Risk Score

Malware Insights

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

This PDF is identified as malicious by an ML classifier and contains a large number of external links, indicating it is part of a link farm. The document body, though obfuscated, contains URLs that likely lead to further malicious content or downloads. The primary attack pattern involves luring users to click these links, potentially leading to the download of additional malware.

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://rsghzb.salon225.com/uploads/1/3/0/7/130776502/130776502.html#list+of+acids+and+their+formulas+pdf
    • http://johnchadwick.com/uploads/1/3/0/7/130776219/6832e981ad6.pdf
    • http://stjohnslutheranchurchjenison.org/uploads/1/3/0/2/130273812/5726995.pdf
    • http://suekennedycelebrant.com/uploads/1/3/0/3/130324005/dizolivisorul-pedidubezoxi.pdf
    • http://qmobix.net/uploads/1/3/0/2/130289399/746293b5a.pdf
    • http://www.litigatingforchange.org/uploads/1/3/0/3/130313132/larezaxexuba_kugopuni_kixekaxugebisux.pdf
    • http://mail.trimindmedia.com/uploads/1/3/0/4/130476412/562369.pdf
    • http://www.goodgirlgonegeek.com/uploads/1/3/0/4/130489019/9757d88.pdf
    • http://omundoeolimite.com/uploads/1/3/0/2/130272859/fudin.pdf
    • http://radioteleunite.com/uploads/1/3/0/5/130546076/vawazon_zofatemujakirub_fowuwe.pdf
    • http://bookingcumbria.co.uk/uploads/1/3/0/2/130272579/jijuvopiredawogegi.pdf
    • http://sweetwatermanors.com/uploads/1/3/0/4/130488417/6237788.pdf
    • http://cosmosit.net/uploads/1/3/0/6/130603690/fegumutogez_majovub.pdf
    • http://themoviefangirl.com/uploads/1/3/0/2/130291499/7322942.pdf
    • http://nicksandmay.com/uploads/1/3/0/2/130271031/3a92a66ecf11.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_off00006631.bin
4c9605583a705694e2086f10d58069ad215e91cd80b073decfa82bbe7b37b711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6631 7780 bytes

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