Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc2445002e82b6f…

MALICIOUS

PDF

83.7 KB Created: 2021-03-11 04:25:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f77b91271f33f1b37b6fd3fd668f9191 SHA-1: 4e7efdba4a8ecce407b798d9f2ee526f64ac0fff SHA-256: 9bc2445002e82b6f9de87faccd32be86c90a793f6e2e4aecf75d80634cb69f3e
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'Osha standard' and 'wkhtmltopdf', potentially used as lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/strik?utm_term=osha+standard+29+cfr+1926+subpart+l+%2526+m PDF link annotation
    • http://milansit.space/amtrak_city_of_new_orleans_route_guide7a5l9.pdfIn PDF document text
    • http://show-visitor.xyz/40032119743k0g65.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/wiredimezavavobejuta.pdfIn PDF document text
    • http://diluzadumavotux.getenjoyment.net/medios_de_comunicacion_tipos_de_lenguaje.pdfIn PDF document text
    • http://educationonline.website/mozosurebottft2c.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/sopakeguvimexakun.pdfIn PDF document text
    • http://olymptrade.buzz/42854481231r2695.pdfIn PDF document text
    • http://fastdonwload.space/brahms_lullaby_pianok087b.pdfIn PDF document text
    • http://bunutib.mywebcommunity.org/patofisiologi_filariasis.pdfIn PDF document text
    • http://form-copyrightservices.com/kopibawebowosk056.pdfIn PDF document text
    • http://trysalon.xyz/how_to_become_an_emergency_doctor_in_canadafiyey.pdfIn PDF document text
    • http://hotita.fun/90392298433kz3z2.pdfIn PDF document text
    • http://detonic-hypertonie.website/reflex_klystron_theoryvjue0.pdfIn PDF document text
    • http://tameenegypt.com/hamilton_beach_ice_cream_maker_recipes_strawberryqwxcn.pdfIn PDF document text
    • http://appeal-ig.com/gudosibiwazs2x0.pdfIn PDF document text
    • http://kyponnik.online/67206592142vhkmb.pdfIn PDF document text
    • http://fishing-rods2.club/registro_anecdotico_preescolar5zv51.pdfIn PDF document text
    • http://tryplafond.xyz/hemoglobin_a1c_chart_by_agen0mtn.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/fufiwiwotogitebevugow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d35f29-0db7-4fb9-b1e2-18af3fd25555/mac_chrome_flash_plugin_blocked.pdfIn PDF document text
    • http://vipodozuwuwo.epizy.com/77261943854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/035bbf54-e835-4b41-8bd3-0b71417dc353/95905825248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b70f38dd-c828-45ce-980d-a5b361451eb4/new_english_words_with_tamil_meaning.pdfIn PDF document text
    • http://xamawesurasido.epizy.com/feviwaboxitibaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d05374-9fe9-49b7-a121-aa6cffb2da1b/list_of_modal_auxiliary_verbs_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc59d82b-a14f-4695-b8fe-608830250339/neato_xv_21_my_vision_was_blocked.pdfIn PDF document text
    • http://zobatokuvanoz.epizy.com/happy_endings_tv_show_reboot.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 5904 bytes
SHA-256: eddf1390338b966bd0de57e6c966c90330dddf7b87c7c320c52ab941b07bbee6
font_01_sfnt_off00011c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C57 10872 bytes
SHA-256: d218dfc88bc382e90b9744bb559ea9ea61e9b3a8bf78a5d373a00f96bdec7f44