Malicious PDF — malware analysis report

Static analysis result for SHA-256 16368c8c1c90c598…

MALICIOUS

PDF

36.7 KB Created: 2020-04-02 03:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: da662104b4c81eb932de52959d7bf804 SHA-1: a0506ea00ae7ffb9e764b3ad64d027b5927259b3 SHA-256: 16368c8c1c90c59855f7f8b0a59fd558ee10b086bcb3865c1c7cbac1c6dbbf15
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of external links to other PDF files hosted across numerous domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://offxllc.com/uploads/1/3/0/4/130435755/130435755.html#polyatomic+ionic+compounds+worksheet+answers
    • http://flawedsounds.com/uploads/1/3/0/7/130776458/ffbce6.pdf
    • http://citizentrack.com/uploads/1/3/0/6/130620916/ccf02a1f.pdf
    • http://kindness.empatico.org/uploads/1/3/0/5/130550888/028311d60aebb1d.pdf
    • http://marxproductions.net/uploads/1/3/0/4/130475982/kilegiwip.pdf
    • http://kotbabos.site/uploads/1/3/0/6/130621394/ab5fab8e.pdf
    • http://buckybuchanan.net/uploads/1/3/0/5/130588895/miborexeg_xudoredode_monopenepuzof.pdf
    • http://mouse-monkey.com/uploads/1/3/0/5/130541743/pegupav_zovetaxizudos.pdf
    • http://projectimpetus.com/uploads/1/3/0/8/130813373/ec170bee595a4.pdf
    • http://gracelands.co/uploads/1/3/0/5/130590395/23f7221a4c80f2.pdf
    • http://hochschulteam-dresden.org/uploads/1/3/0/6/130605048/getodotuvigine.pdf
    • http://yukikotaylor.com/uploads/1/3/0/9/130969879/9214215.pdf
    • http://fretbuzz.com/uploads/1/3/0/6/130603771/82187ace.pdf
    • http://elainemileswrites.com/uploads/1/3/1/0/131070434/veguzejezanas.pdf
    • http://nunsenselondon.com/uploads/1/3/0/4/130489144/zisafizeva.pdf
    • http://wescocontracting.com/uploads/1/3/0/6/130639358/xisegaj.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/
    • 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_off00005475.bin
c89b8c0c347227eaf0b7f88d60977baa510a0e452e5c1e4a497914bb13224803		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5475 6776 bytes
font_01_sfnt_off00006f9d.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9D 16204 bytes

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