Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f68e7836b27778…

MALICIOUS

PDF

46.5 KB Created: 2020-03-28 10:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cca20d27547e3ba065f1b746a10ecb0b SHA-1: 234a56b8811dc9dce4e1cacdbe4189a0e20354f4 SHA-256: 90f68e7836b2777812a3ef93a9592ea8862c9b76a065072f57842627e713dbcb
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are likely part of a link farm or SEO manipulation scheme. No scripts were extracted from this sample.

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://merrylandevent.com/uploads/1/3/0/5/130544625/130544625.html#autores+del+test+de+vak
    • http://patchworksgroup.com/uploads/1/3/0/3/130323260/d84a61692324.pdf
    • http://senbu2l4dghhcmfkztz0aefwcmlsmjaxoq.heartchristianacademy.org/uploads/1/3/0/3/130379065/5277096.pdf
    • http://www.llanolionsclub.com/uploads/1/3/0/2/130288447/5351724.pdf
    • http://umbrellasup.org/uploads/1/3/0/5/130546486/pijijiv_fusirimitadol_zekurifudidaja_batujiz.pdf
    • http://canberrabirthservices.com/uploads/1/3/0/4/130477414/84315f506d25b.pdf
    • http://monionline.com/uploads/1/3/0/7/130738846/7848910.pdf
    • http://oclgmedical.com/uploads/1/3/0/6/130620887/zexolowumix.pdf
    • http://rackasconsulting.com/uploads/1/3/0/4/130483591/1078935074.pdf
    • http://virginiaconcretepaving.com/uploads/1/3/0/7/130776300/5879270.pdf
    • http://hearholiday.com/uploads/1/3/0/7/130776073/bilozagewakanu.pdf
    • http://wastewaterexpert.net/uploads/1/3/0/2/130288637/8981744.pdf
    • http://sylviafodor.com/uploads/1/3/0/7/130776262/lofewuka.pdf
    • http://oohmami.co.uk/uploads/1/3/0/5/130588157/wewofatilabuwe.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_off00008a89.bin
10eb998be04f530e5c0b8da7b5af17eba13f6cb83f7f2b05609a92de23639b13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A89 9288 bytes

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