Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ed9769e8a5dbd2…

MALICIOUS

PDF

32.6 KB Created: 2020-04-18 13:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fd283bb031ccc9568159cc74f2f71ab3 SHA-1: 3af57190ec88d6bc82b1d70298be64de3efb0c35 SHA-256: 66ed9769e8a5dbd2e7ffa6ecf46fb928a448b5459cf3dd7765f45b5805ed00f8
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, disguised as a crossword answer, which is a common lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://everestdobie.com/uploads/1/3/0/5/130590361/130590361.html#hostile+incursion+crossword+answer
    • http://lorrainemeyer.com/uploads/1/3/0/5/130551190/7062060.pdf
    • http://fluidartcreative.com/uploads/1/3/1/6/131606951/rovula.pdf
    • http://palmbranches.org/uploads/1/3/0/7/130739218/wunufelebuwon_gafuxunilosusud_bibebe_jaxisazezisiga.pdf
    • http://fulltimeman.com/uploads/1/3/1/4/131438416/dedizimufemezo.pdf
    • http://marquisdterrell.com/uploads/1/3/0/5/130551055/xowejixuja-divizapaginefuv-natuwuj-pibogifovefido.pdf
    • http://greatermtolivembc.org/uploads/1/3/0/6/130620484/d26bf3.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005808.bin
37f5415937b81fb06d985e3f952633510a9ccbe52440b5897eb2ab084ab6e54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5808 7912 bytes

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