Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc96bcf831f4bea…

MALICIOUS

PDF

45.3 KB Created: 2020-04-01 18:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ce41349befd98f2f5f8f39a842cc28d8 SHA-1: 84eb45105b6a25d974a5925047cfd61f8464253c SHA-256: 5cc96bcf831f4bea31854c32e8e4d791fd52cefb08d759348fe11c453a4be1eb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The embedded content, though partially corrupted, includes URLs that are part of this network. This suggests the document's primary purpose is to redirect users to this network of sites.

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://antechprojects.com/uploads/1/3/0/6/130603709/130603709.html#manual+de+funciones+de+un+comunicador+social
    • http://feedinglina.com/uploads/1/3/0/6/130604117/3656696.pdf
    • http://pabocora.com/uploads/1/3/0/4/130476162/a1b8186.pdf
    • http://www.time2bondtravel.com/uploads/1/3/0/8/130813923/6651287.pdf
    • http://texas-trio.com/uploads/1/3/0/7/130739379/9707953.pdf
    • http://anderson-missions.com/uploads/1/3/0/7/130775856/nakame.pdf
    • http://sagesoul.net/uploads/1/3/0/5/130543293/8629892.pdf
    • http://polishedthredz.com/uploads/1/3/0/3/130323564/nuxomesunop.pdf
    • http://eagleplasteringinc.com/uploads/1/3/0/8/130874569/5d99898f647.pdf
    • http://bluesdaddybeards.com/uploads/1/3/0/6/130639746/vadiropaler-wewuk-majovejoje-mobomutu.pdf
    • http://bouwtotaalfriesland.nl/uploads/1/3/0/2/130291712/e2eb751be44c.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_off0000690d.bin
a96d74afbd722387f44cf43968f10012a2dc2efed052609e35ebaf491bfb1fa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x690D 8268 bytes
font_01_sfnt_off00008727.bin
d8435aac11388b8214bfc980e857510ef47481ba706565f25bd6cae8efb01319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8727 2828 bytes
font_02_sfnt_off00009117.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9117 16036 bytes

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