Malicious PDF — malware analysis report

Static analysis result for SHA-256 761fcd475ea8b220…

MALICIOUS

PDF

36.3 KB Created: 2020-06-16 05:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 281dbb2cc51ea5384f49c7893297d365 SHA-1: 07a07212d774006b172445f4b59412431968fcc6 SHA-256: 761fcd475ea8b2205a87ebbd74b9887d04cc199c6e5e3d5e9c87c847186783e8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed to act as a link farm, directing users to a large number of external PDF files hosted on various domains. The embedded URLs and the heuristic firing for PDF_SEO_LINK_FARM indicate a clear intent to manipulate search engine results or drive traffic to these linked resources. The ML classifier strongly supports the malicious nature of this document.

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://cvayn.bpmtc.com/uploads/1/3/0/5/130551087/130551087.html#flocking+powder+nail+tutorial
    • http://wildwoodsoklahoma.com/uploads/1/3/0/7/130740456/2562215.pdf
    • http://spectraconsultingservices.com/uploads/1/3/0/5/130589050/88464fea5c5.pdf
    • http://13x.undesirable.us/uploads/1/3/0/5/130589031/63bcec4.pdf
    • http://brasstackspersonalstyling.com/uploads/1/3/0/7/130776405/52d42c783e6.pdf
    • http://advancedarsenalnutrition.com/uploads/1/3/1/3/131382531/binujagosofi.pdf
    • http://threesunflowersboutique.com/uploads/1/3/1/4/131452826/xiketixejorix_pidej_fofol.pdf
    • http://bluelinecustomholsters.com/uploads/1/3/1/4/131437157/1517961.pdf
    • http://cleaningyournest.com/uploads/1/3/0/5/130590339/4565f8.pdf
    • http://fencinghonolulu.com/uploads/1/3/0/6/130604766/1187127.pdf
    • http://cardetailingleicester.com/uploads/1/3/0/5/130543684/fezug-mewufepumel-limifurovaxamef.pdf
    • http://74-123-78-212.mgwnet.com/uploads/1/3/0/5/130539373/zepazakutuzitum.pdf
    • http://cafegraziesf.com/uploads/1/3/0/8/130813448/5e3cc5333.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off00004f71.bin
a42fc88e3ff46101de974ec602adaa11c411cd8f0ade8f99b2bef240bbe852f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F71 9640 bytes
font_01_sfnt_off000070a8.bin
cf52bd17e7fa65be676477f250e4e475e4a06930f9249908511e02770f9ee1f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A8 16120 bytes

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