Malicious PDF — malware analysis report

Static analysis result for SHA-256 76aa16c2e213e912…

MALICIOUS

PDF

41.0 KB Created: 2020-04-03 16:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 07139b4ddb070d2fc7970086fee152f4 SHA-1: f3008c8b38312858a588758494ff2b5419a641cb SHA-256: 76aa16c2e213e91212e89328a85f0fb0561f1b243e54ea0a7855f43d2536de15
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a link farm, embedding a large number of external URLs within its content. The primary heuristic, PDF_SEO_LINK_FARM, indicates a deliberate attempt to create a network of linked pages, likely for SEO manipulation or to host malicious content. The ML classifier strongly supports the malicious nature of this file, with a high confidence score. The embedded URLs suggest a potential for redirecting users to malicious sites or downloading further payloads.

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://kingstechdeals.com/uploads/1/3/0/5/130590438/130590438.html#big+o+anime+torrent
    • http://teslamed-diagnostik.ru/uploads/1/3/0/6/130621648/tadizimir.pdf
    • http://ulamerica.com/uploads/1/3/0/7/130776105/sakupegeronagugek.pdf
    • http://fityourbody.eu/uploads/1/3/0/4/130488244/mekogudovomowa.pdf
    • http://karenjhudson.com/uploads/1/3/0/2/130271068/5100752.pdf
    • http://letterstohillaryrc.com/uploads/1/3/0/7/130774966/miberulokinar.pdf
    • http://truelightcleaning.com/uploads/1/3/0/7/130775045/pomexujagegevi.pdf
    • http://chitowngala.com/uploads/1/3/0/4/130476616/78d7e.pdf
    • http://whm.tacosmexican.com/uploads/1/3/0/2/130273589/2182192.pdf
    • http://hendrixroadbaptist.org/uploads/1/3/0/4/130483902/3102479.pdf
    • http://adersolar.com/uploads/1/3/0/6/130620946/lapulovetiga.pdf
    • http://thesocialweekly.com/uploads/1/3/0/7/130775694/183491.pdf
    • http://thehalfwayhorse.com/uploads/1/3/0/5/130551551/1787206.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_off0000733f.bin
17d5b9ebfba5922e5f9bc740373092b9ae29a53e8c9411346f1fce8126bc31f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x733F 10240 bytes

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