Malicious PDF — malware analysis report

Static analysis result for SHA-256 093655de0789fd61…

MALICIOUS

PDF

48.9 KB Created: 2020-04-21 16:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 78a401811a1294d5190e54211d525958 SHA-1: b28fd0db36a28372eee5d435fd659182a8459283 SHA-256: 093655de0789fd61114dd88de92a3847e9d7b262c99c365e9dacb3a794af7d51
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to appear as legitimate content while redirecting to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to obscure the true nature of the links. No scripts were extracted, but the extensive use of external links points towards a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://djkoza.com/uploads/1/3/0/7/130739158/130739158.html#hanukkah+oh+hanukkah+free+sheet+music
    • http://browsenodeinfo.com/uploads/1/3/0/8/130813325/tigan-razaxikesejof-vovobi-guzidojuvepa.pdf
    • http://emmas-sweets.com/uploads/1/3/0/4/130483821/6386157.pdf
    • http://lingbigyong.com/uploads/1/3/1/3/131383959/nufibe_riveratafedop_wulewivobakune.pdf
    • http://immanuelchildrensfoundation.net/uploads/1/3/0/6/130604093/8c8f2a93fb3.pdf
    • http://whitecranemartialarts.com/uploads/1/3/0/6/130603827/7965262.pdf
    • http://charms2020.com/uploads/1/3/0/6/130620297/1922481.pdf
    • http://newviewclassical.com/uploads/1/3/0/5/130539679/vozuwilijuze.pdf
    • http://celebratethebuffalo.com/uploads/1/3/0/2/130288002/gejiwe-rijanajitimaveb-zupulawi.pdf
    • http://townandcountrypainters.com/uploads/1/3/0/3/130313333/wefizazuxiwikim_zokukawaxa_nesamupegevi.pdf
    • http://gonzalezprio.com/uploads/1/3/0/2/130272360/kidunigumer_pesukikelazib_zigal_xezodonakamu.pdf
    • http://ambermission.com/uploads/1/3/1/3/131384797/gibobezujugi_jonupuw.pdf
    • http://keithrobertson.org/uploads/1/3/0/2/130271035/tevajuvifi.pdf
    • http://hansenroofingandsiding.com/uploads/1/3/0/2/130272493/1810475.pdf
    • http://better4free.org/uploads/1/3/1/4/131455019/1059044.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_off0000948d.bin
d9ea8b81e07e05f703585b7da5dd8a9e63520fb1ae5ef6b1488c2ba14122a657		 pdf-font-stream PDF embedded font (sfnt) at offset 0x948D 9176 bytes

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