Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71e28c56a588e55…

MALICIOUS

PDF

37.6 KB Created: 2020-04-05 11:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0e572100fa6706e9b2110d30166a02ad SHA-1: d4052413a10697875d93dd254aacf184c7c72ac8 SHA-256: c71e28c56a588e55642c5b9e534ff7ef5f9fde7720d07f33e42f6aeb8f5e8422
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, while partially corrupted, contains references to URLs that are part of this link farm, suggesting the primary purpose is to drive traffic to these external resources.

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://klzfarmboyz.com/uploads/1/3/0/9/130969476/130969476.html#an%C3%A1lisis+pestel+de+una+empresa+pdf
    • http://infocuspurewater.org/uploads/1/3/0/5/130542894/ff352a4a53.pdf
    • http://lucasartmusic.com/uploads/1/3/0/4/130475984/sugobapuz.pdf
    • http://shabbydabbsdesign.org/uploads/1/3/0/3/130379770/fanosikegoj-mafejinuk-sodur.pdf
    • http://paintrockperformance.com/uploads/1/3/0/6/130640022/xovobato.pdf
    • http://centrallakessar.com/uploads/1/3/0/6/130639877/rajeko.pdf
    • http://band-ems.org/uploads/1/3/0/6/130620923/824857.pdf
    • http://michelleblanchette.org/uploads/1/3/0/8/130874082/pugakirire_mazema.pdf
    • http://circleofserendipity.net/uploads/1/3/0/7/130775388/6558246.pdf
    • http://griffenlaw.com/uploads/1/3/0/2/130292125/9553587.pdf
    • http://visions-of-furs.shop/uploads/1/3/0/6/130621815/3269095.pdf
    • http://willowhillwelshtx.com/uploads/1/3/0/8/130814020/xezor.pdf
    • http://drmallinaentclinic.com/uploads/1/3/0/2/130288557/filesirej.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_off000068b6.bin
5f34af6232b185c1b103678f161acf93d78bde474523bd0f865bd0697d4287ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B6 8460 bytes

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