Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b6de1111c4af38…

MALICIOUS

PDF

61.4 KB Created: 2020-03-16 17:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3185572ba2a8c0fe1991f9196d4a89e5 SHA-1: 015836267b5e78011de283e1bc3c53a75b940536 SHA-256: e4b6de1111c4af3874746417d0b96153f899e2b433179c35e322ccad2b940f1f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous external links, identified as a link farm, with the primary URL pointing to 'http://theideasofm.com/uploads/1/3/0/2/130272101/130272101.html#standard+heat+of+formation+mgo'. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the structure suggests a lure to a malicious website.

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://theideasofm.com/uploads/1/3/0/2/130272101/130272101.html#standard+heat+of+formation+mgo
    • http://draygoncrafts.com/uploads/1/3/0/5/130545421/8927111.pdf
    • http://clarksurveyor.com/uploads/1/3/0/7/130740212/kumus-tovejarakote-norezerin.pdf
    • http://dataforgood.design/uploads/1/3/0/6/130639026/gekape.pdf
    • http://repax.network/uploads/1/3/0/8/130814526/kolukifidume.pdf
    • http://inhuiselijkekring.nl/uploads/1/3/0/5/130590710/moxigojib-govirexux.pdf
    • http://jcdiscovery.com/uploads/1/3/0/4/130490245/sizopenomavokus.pdf
    • http://escape2you.com/uploads/1/3/0/8/130873990/rogarawazuge.pdf
    • http://mytechstore.biz/uploads/1/3/1/1/131164132/f48fb0bc967835e.pdf
    • http://kendallwindowcoverings.com/uploads/1/3/0/5/130545194/deralomadumidojavod.pdf
    • http://ducknroll.net/uploads/1/3/0/2/130271097/xofogoneruboxiza.pdf
    • http://lansdownewritersworkshop.com/uploads/1/3/0/5/130539458/eee42dea5a462f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b401.bin
a4f664a981ad01cb3731ecb0b8eb10d925478f3ac94080077ec3c65c1efed22e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB401 10256 bytes
font_01_sfnt_off0000da78.bin
f85a0e175dc30fb5b16a052844adcdd878a1c67ced661adc7c4312591292437e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 3632 bytes

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