Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7fbc7b2fe30262…

MALICIOUS

PDF

85.8 KB Created: 2021-04-07 22:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0b150ea1081bb0ce088ecbeeab23e5e3 SHA-1: 86be4e6f9d179ae77f2404b1e81b64d248181c27 SHA-256: fb7fbc7b2fe302625ff2a4883a3e5bc501129a8801889054edaca9cf8c9eb464
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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.
  • 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://dugedepap.ru/wix?keyword=ap+euro+exam+study+guide+quizlet PDF link annotation
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/168827.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/how_to_get_damascus_knife_mw.pdfIn PDF document text
    • http://riniwodifole.medianewsonline.com/capitalismo_monopolista_e_servio_social_capitulo_1.pdfIn PDF document text
    • http://raifaisentgo.online/marvel_avengers_the_ultimate_character_guidenjo9n.pdfIn PDF document text
    • http://velavedi.iblogger.org/template_boy_birthday_invitation_free.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/43568115300v7vcn.pdfIn PDF document text
    • https://rirudelibuwa.weebly.com/uploads/1/3/1/6/131606594/7d7f77.pdfIn PDF document text
    • https://juzunuxav.weebly.com/uploads/1/3/4/3/134316531/41434.pdfIn PDF document text
    • http://zubiki.top/onan_diesel_generator_service_manualu3s4i.pdfIn PDF document text
    • http://pop-marketplace.ru/through_the_wormhole_with_morgan_freeman_full_episodes0rzcq.pdfIn PDF document text
    • http://soldonlakewood.com/gexufej2dhht.pdfIn PDF document text
    • http://najelipopusivut.getenjoyment.net/chemical_disinfectants.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tumobuwixakeg.atwebpages.com/burafu.pdfIn PDF document text
    • http://petegamab.epizy.com/case_study_method.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb0bbe8-6bfa-401d-8144-0a44c1905875/currently_no_logon_servers_available_to_service_the_logon_request_2008_r2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/421e5349-a50c-4516-a1ce-67680d8b48ab/les_miserables_musical_album.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d0bf72c-beca-4450-b97d-91f82615926e/everyones_an_author_3rd_edition_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a64238-24a1-4254-a384-11b306bf0d5e/18987358598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab38372-f2c9-446c-b161-62d9bbc743fa/ravpower_rp-pb19_manual.pdfIn PDF document text
    • http://surobufalinaxis.epizy.com/dead_to_the_world_lyrics_nightwish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2cd478d-2328-4c0f-ba8c-f175038fb42c/kolewumavebawinevumat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501b9182-ca78-4333-b883-2452bdb2ce7c/6467377621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4449a12-975f-4529-a06d-719b0ae26f79/41830109005.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_off00010fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 5616 bytes
SHA-256: e23fc4ac64830b36807b65ae8e7a6e66b358ffc44e652fa06f766bf330e1f281
font_01_sfnt_off000122d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D7 11580 bytes
SHA-256: 8604f8489d27fcc27089bdcb1ab7e14bf39ba2e0f344a9f2bcbe61dbe3246e58