Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bc4b897947f3f6…

MALICIOUS

PDF

46.9 KB Created: 2020-03-30 21:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2676ecfffde7baa50fbecfc3e4a2c2d9 SHA-1: 99970859b0a5ec8dd2d928461df359314f9ac63e SHA-256: 59bc4b897947f3f696453b01bf7923ac5f670c22341ea282f4483e47e6d86de5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to numerous external sites, likely for SEO poisoning or to host further malicious content. No scripts were extracted, and the document body was heavily obfuscated.

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://ecgcore.com/uploads/1/3/1/4/131453432/131453432.html#teoria+de+las+bandas+en+metales
    • http://asccomplianceready.com/uploads/1/3/0/6/130604886/2748008.pdf
    • http://thesmallbusinessunion.com/uploads/1/3/1/1/131164317/819007c75d5a5.pdf
    • http://firstbookonline.net/uploads/1/3/0/7/130774964/xirazusepaxazo_gazixiz_lepomodovo_putisuv.pdf
    • http://competitivekarting.com/uploads/1/3/0/6/130639811/ec18b8b.pdf
    • http://sadtown.com/uploads/1/3/0/6/130620449/jobanipodekuda_gesutozeda.pdf
    • http://krystalklearmedia.com/uploads/1/3/0/6/130639514/toxajukitoda.pdf
    • http://chrislockett.com/uploads/1/3/0/2/130289755/mawadaposujiru-pavivugaju-jezemixisiviwu-zeliguwemorisum.pdf
    • http://804windows.com/uploads/1/3/0/7/130775647/pukopuganiwitugojux.pdf
    • http://imedxusa.com/uploads/1/3/0/3/130313403/3524027.pdf
    • http://gofhsfalcons.com/uploads/1/3/0/4/130491932/2129844.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e26.bin
dac91bc129bf37d5c4429b5e51f55a4eac5059060b6c9105dca50fc7174170e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E26 8596 bytes
font_01_sfnt_off00008d9d.bin
db941950075fbddbb769ffec3cd55a9daadf8646ef9881dd4ce548a060869eba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D9D 2880 bytes
font_02_sfnt_off000097de.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97DE 16036 bytes

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