Malicious PDF — malware analysis report

Static analysis result for SHA-256 124533f4533a61c7…

MALICIOUS

PDF

69.3 KB Created: 2020-03-07 12:37:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5b2ea32f50e8ff60522c922dd27eb38a SHA-1: 47439cdf57d5e779065301732c0c5fcbd54eb83d SHA-256: 124533f4533a61c7bffe3fce3d34038a2369cd928097e44f4e7311f928b2f226
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, masquerading as a PDF to Word conversion tool, to various websites. The ML classifier strongly indicated maliciousness, and the presence of a large number of external links suggests a link farm or redirection scheme. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attempt.

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://74-123-78-183.mgwnet.com/uploads/1/3/0/3/130379803/130379803.html#%E1%BB%A9ng+d%E1%BB%A5ng+chuy%E1%BB%83n+file+pdf+sang+word
    • http://www.vintagevibe-online.com/uploads/1/3/0/6/130603948/tomibasanim.pdf
    • http://industryr.com/uploads/1/3/0/2/130291373/pefanenased.pdf
    • http://separateclothing.com/uploads/1/3/0/4/130477414/ca9320c1f5f0d37.pdf
    • http://musikfuerkids.com/uploads/1/3/0/6/130604639/wibuni.pdf
    • http://chantelle-shaw.com/uploads/1/3/0/6/130603764/8999449.pdf
    • http://www.forty2sixtyeighthockey.com/uploads/1/3/0/5/130589391/junuxuruxeg-mifebenurewif-pakafufapetese.pdf
    • http://www.matthewpeckhamtenor.com/uploads/1/3/0/9/130969504/mogunizilitaresu.pdf
    • http://mortenlund.dk/uploads/1/3/0/6/130621554/bizemujekinizizik.pdf
    • http://dragonflylivestockranch.com/uploads/1/3/0/2/130288317/f027e5af.pdf
    • http://wrappedupinlove.com/uploads/1/3/0/2/130289571/fobajilizevub-limarexi.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8b6.bin
dd2a5ed9f7ccef5cae5ef2a5d4ec080f17ede758343dbbf64dc15874ee300c8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B6 10628 bytes
font_01_sfnt_off0000da7c.bin
27aad4e7100ae85831cc1a9cf4859e84521ff6b1ee9ac199fa10e6c4d4b25dad
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 2736 bytes
font_02_sfnt_off0000e429.bin
8ef56b0fd1d29fdd0374d3afe1596447556cf7aa91f94c4aa274f615f126c8f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 24808 bytes