Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcba1396686125bc…

MALICIOUS

PDF

77.3 KB Created: 2021-03-18 15:04:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9330c5589802e0f1f35ac0975c276b83 SHA-1: 97d8874cf6ac02e4f8412cf2f923483f715d3621 SHA-256: dcba1396686125bc17574f6502f247757dbc82be13d055c382365d144e2f0db3
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a tactic to manipulate search engine results or redirect users to malicious sites. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs further supports this. While no scripts were directly extracted, the structure and link farm behavior are indicative of a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://dafemum.ru/123?utm_term=aluminium+manufacturing+process+pdf
    • https://cdn.sqhk.co/posebozej/1UH7Jgd/pusaxagiviwilatizepuzu.pdf
    • https://jipoditilab.weebly.com/uploads/1/3/1/4/131407274/rurugaloseli.pdf
    • https://cdn.sqhk.co/wudenedu/f6ieih4/dictator_movie_online_play.pdf
    • http://itawegan.space/what_is_the_sad_tik_tok_song_calledl8wux.pdf
    • https://wugovokida.weebly.com/uploads/1/3/4/3/134319073/rewetegedure_titipow.pdf
    • https://cdn-cms.f-static.net/uploads/4494432/normal_6045e514ac35c.pdf
    • https://cdn-cms.f-static.net/uploads/4410020/normal_601c73cbe166e.pdf
    • https://cdn.sqhk.co/sodelaranu/NYhaiep/american_red_cross_emergency_first_aid_kit.pdf
    • https://cdn.sqhk.co/titabofasika/ageidgg/61699359155.pdf
    • https://cdn-cms.f-static.net/uploads/4460057/normal_6035b2062bb09.pdf
    • https://satemegozujig.weebly.com/uploads/1/3/4/4/134477909/849e3.pdf
    • https://cdn.sqhk.co/kizewetete/jFijcgj/elite_killer_swat.pdf
    • http://getplafond.xyz/zozotoxivopevedaseskqdys.pdf
    • https://zesadokalefon.weebly.com/uploads/1/3/2/6/132681767/677f210.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/96c8fb92-218b-408d-85ae-8759ee2906a9/godedanuvonu.pdf
    • https://uploads.strikinglycdn.com/files/87a3cd52-aa87-4d99-8053-ddcf3ac07e4d/variador_yaskawa_v1000_manual_espaol.pdf
    • https://s3.amazonaws.com/kuxegu/43503962991.pdf
    • https://s3.amazonaws.com/luramamelolem/bba_business_analytics_meaning.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0be.bin
4ea9aaa1d48068eae2dbda191cccb66f8e78605e9cbf6a5e3de207b51074460c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 5464 bytes
font_01_sfnt_off0001033e.bin
b6ec041c86a8e20471f4ac6345af8b9e2c40fa2bbf322672c8dbcda506b9a40e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1033E 10888 bytes