Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f35540db2f90c9…

MALICIOUS

PDF

46.4 KB Created: 2020-04-03 18:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a5389735d0cb3aad19f79f985f0dfa70 SHA-1: 22b884af5babd9d466745ba0a2e340fb311a3b2d SHA-256: 04f35540db2f90c9feb007277fdfba58a6b19329b1974d19d49e848070e0fb38
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content or further stages of an attack.

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://frackingprosandcons.info/uploads/1/3/1/3/131378852/131378852.html#dairy+science+and+technology
    • http://tnhayden.net/uploads/1/3/0/7/130738998/lawajobibolorir-panipowi.pdf
    • http://hairandbeautysuppliesireland.com/uploads/1/3/0/6/130604558/duvavebakeveriv_xamata_tamod_nekopiraver.pdf
    • http://rezervacie.leoncentrum.sk/uploads/1/3/0/2/130287407/rutiwovudurafubivin.pdf
    • http://distripet.shop/uploads/1/3/0/6/130603747/simexirekozakobifuma.pdf
    • http://angelisefsb.com/uploads/1/3/0/9/130969057/jukuzudanixaxezuda.pdf
    • http://equestrezoppe.com/uploads/1/3/1/0/131070398/fidomit-mivozurojen.pdf
    • http://familyreunion2017.com/uploads/1/3/0/9/130969777/4223784.pdf
    • http://unleashthemusician.com/uploads/1/3/0/8/130874039/natageruxavuk-gazakitafosogew-zorakelamisob-pabebitake.pdf
    • http://cpanel.ladse.org/uploads/1/3/0/7/130738890/6495832.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_off0000775d.bin
77faf122e96cebdde8114e0697b0b5ef9b5186243583877788a377510310ac99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775D 8160 bytes
font_01_sfnt_off0000970b.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x970B 16204 bytes

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