Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb422d42771515a…

MALICIOUS

PDF

82.8 KB Created: 2020-04-08 03:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 84de9291dda4db720667ead6842b5485 SHA-1: 45b0c6fc1fc6de41c22dd21cbfa74d8ccf661465 SHA-256: 5bb422d42771515a8147414a2ac31756d062e4297a61ecf8a2308667180e31ca
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9830

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://teataxagency.net/uploads/1/3/0/3/130379172/130379172.html#surface+area+of+a+sphere+using+spherical+coordinates
    • http://drome-provence-gite.com/uploads/1/3/0/6/130621130/1479018.pdf
    • http://seareach.org/uploads/1/3/0/2/130289359/jitul-vagakapovina-tuzudan.pdf
    • http://themissingelement.solutions/uploads/1/3/0/8/130873915/zaxegulevukolip_pipudazomipo.pdf
    • http://josephwwashingtonpw.com/uploads/1/3/0/8/130874326/bavomusuwulifavubid.pdf
    • http://thebestrateinsurance.com/uploads/1/3/0/4/130483606/a661aa9.pdf
    • http://transitionrva.org/uploads/1/3/0/5/130538953/9398108.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_off0000ef0e.bin
c028f56aa5b4f31bb23218fa3d16f1bf795ccbbc495714453bba6a73d011101a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 10808 bytes
font_01_sfnt_off000116b0.bin
9ed9954ef527afa38e6f75db63ad66ca58a7baeee86af9571e2cb142d6c6e1bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B0 4216 bytes
font_02_sfnt_off00012564.bin
b807628cae49648c7cc199e59db98302b9cabdbff4946bdb4eff3c87d1b67255		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12564 16724 bytes

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