Malicious PDF — malware analysis report

Static analysis result for SHA-256 512e89cae22efcc2…

MALICIOUS

PDF

74.0 KB Created: 2021-03-27 19:15:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a15edf9d2d37db4025933f46eaf9a8a6 SHA-1: d311c8b4277d7b435183bdeee603dc49a2b801e5 SHA-256: 512e89cae22efcc2523c69a85b2779cac096fdc9cf1205e3e1d914ff7cd9037b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to domains that appear to be part of a link farm or SEO spam operation, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=medicina+antroposofica+pdf
    • https://cdn.sqhk.co/disonixures/TZmIge2/39606960299.pdf
    • https://cdn.sqhk.co/tosobulig/jfuLJjj/mixakigoboja.pdf
    • https://cdn.sqhk.co/furikute/f8genhf/adm_pro_latest_cracked_apk.pdf
    • https://cdn.sqhk.co/midijanere/gdOhigc/silver_cloud_apartments.pdf
    • http://fasadi.site/37429756298u7e5c.pdf
    • http://pornbustyvids.com/book_thief_audiobook_youtubel3c72.pdf
    • http://nicechange.space/736723406647za0t.pdf
    • https://cdn.sqhk.co/definuseju/Hgfyjfv/within_movie_2009.pdf
    • https://cdn.sqhk.co/mamidusidozu/hDjiDif/kufanenukudekinegogoxivu.pdf
    • https://cdn.sqhk.co/lizasizova/dV4Pf9M/3d_penguin_craft.pdf
    • https://cdn.sqhk.co/sulugedako/dgjynii/vida_saludable_sep_4_grado.pdf
    • http://checkmycredit.info/que_es_la_estructura_de_un_texto_descriptivonr7z7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wipitawakewemex.rf.gd/cahier_des_charges_des_automatismes._analyse_fonctionnelle.pdf
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_cd9d57b97290436592fa3ff38e8f37c7.pdf?index=true
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_4fef09d4e93644748a8a877df4f62137.pdf?index=true
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_8314358fa8784f29956e8c95e31dbbef.pdf?index=true
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_bdae0a2945b2472182dad2f5dd226796.pdf?index=true
    • http://xaterukojokose.rf.gd/96299045435.pdf
    • http://pumazujawawu.rf.gd/preeclampsia_e_eclampsia.pdf
    • https://s3.amazonaws.com/takateg/real_football_games_for_mobile.pdf
    • https://s3.amazonaws.com/guxosa/9887762925.pdf
    • http://riwexakax.epizy.com/99656591775.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_off0000dfea.bin
f25caf0a9005811a909b5bfa5c4223c035cd1f4fb95c2c027ac6e06b5a60e9c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 5120 bytes
font_01_sfnt_off0000f170.bin
fa56aab88ac40a1b9fa5202745ffea5a8b5276e787b285867d8713549824ad7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 13332 bytes

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