Malicious PDF — malware analysis report

Static analysis result for SHA-256 1072e89ba75106c1…

MALICIOUS

PDF

51.7 KB Created: 2020-06-01 21:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 227a5010cad0c38fd73c1d0ca384efd0 SHA-1: 35e98ca61ce1f46668eb455d52112609c1d30311 SHA-256: 1072e89ba75106c1f618e54d0817a51b3f4e0a3a80deff31d0dc8cb18036cc65
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a heuristic specifically identifying a 'link farm' designed to direct users to a large number of other PDF documents. The embedded content, though heavily obfuscated, contains URLs pointing to external domains. This suggests the primary purpose is to redirect users to potentially malicious content hosted on these external sites, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://creditbossbonus.com/uploads/1/3/0/4/130478106/130478106.html#hdm350+multimeter+manual
    • http://brandonkew.com/uploads/1/3/0/7/130739261/sisujev.pdf
    • http://mosaicpros.com/uploads/1/3/0/5/130589313/9295290.pdf
    • http://hostmaster.phillhills.net/uploads/1/3/0/5/130551363/pekupiginak-zupagi.pdf
    • http://hoamedia.com/uploads/1/3/1/1/131163620/381bf3dd9.pdf
    • http://empoweredstepmom.org/uploads/1/3/0/2/130288639/xebupixewafe.pdf
    • http://noggum.info/uploads/1/3/1/4/131453109/4254883.pdf
    • http://creditbossbonus.com/uploads/1/3/0/4/130478106/terms.html
    • http://creditbossbonus.com/uploads/1/3/0/4/130478106/dmca.html
    • http://creditbossbonus.com/uploads/1/3/0/4/130478106/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://taxogagi.files.wordpress.com/2020/06/9992616903.pdf
    • https://wifobawixobi.files.wordpress.com/2020/05/wibimoganolu.pdf
    • https://patoxazab.files.wordpress.com/2020/05/57939616148.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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009e73.bin
c9ad48d59ea7090ca070dfa7887becf3d2a32871b24e02de3172b043933e0e99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E73 10832 bytes

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