Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd42c5536a2868d…

MALICIOUS

PDF

90.9 KB Created: 2021-03-30 13:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: dfb50dd40f8546913b5cdb26d8d2cf92 SHA-1: c80df68168532a4a99cda540d101f518deefae83 SHA-256: 9cd42c5536a2868d5b094c8ce0dc1cacda0bdcb650f8fd04d11e26d099e3dcb6
134 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains embedded URLs, including one pointing to a domain associated with a link farm, and the document body suggests a lure related to medical claims. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates attempts to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://golowaki.ru/123?utm_term=aetna+international+medical+claim+form PDF link annotation
    • http://sabovibin.medianewsonline.com/kujevewar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_603b59bae0076.pdfIn PDF document text
    • https://cdn.sqhk.co/zutigaku/ijMjfha/werewolf_game_all_roles.pdfIn PDF document text
    • http://zagavexakagin.mypressonline.com/minister_for_social_services_contact.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444655/normal_60181613404ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414500/normal_5fe28b7624333.pdfIn PDF document text
    • https://cdn.sqhk.co/dosijowikul/0ighbRg/arbeitszeugnis_formulierungen_schlussformel.pdfIn PDF document text
    • http://gipovasota.sportsontheweb.net/sisesurupogegitid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_60620c54ba31e.pdfIn PDF document text
    • https://cdn.sqhk.co/welosezu/hjde0E6/launchpad_fulton_login.pdfIn PDF document text
    • https://cdn.sqhk.co/pofilese/pyih0ji/luverne_iowa_bank_robbery_suspect.pdfIn PDF document text
    • http://guxubatawuze.iblogger.org/25217465641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_603fb9752c16a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_5fd17453a7686.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/hSjaoyG/dark_side_of_the_ring_new_jack_full.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460968/normal_5fc6ba4f2843a.pdfIn PDF document text
    • http://lisuzigerob.mygamesonline.org/les_histoires_drles_de_toto_et_ses_devoirs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490122/normal_606081dc9eb2c.pdfIn PDF document text
    • http://zopixulowi.iblogger.org/bengali_calendar_1426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460070/normal_6061763eb00df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kopolug.myartsonline.com/vunapopof.pdfIn PDF document text
    • http://vomonulesew.rf.gd/150_best_minimalist_house_ideas_download.pdfIn PDF document text
    • http://dojopugoput.epizy.com/juveninotej.pdfIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/97130444930.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/jamie_cullum_but_for_now.pdfIn PDF document text
    • http://lapetagalelan.myartsonline.com/can_someone_use_stolen_airpods_without_the_case.pdfIn PDF document text
    • http://fuvamawijivef.atwebpages.com/circular_economy_indonesia.pdfIn PDF document text
    • http://bitinorakinin.epizy.com/china_app_store_free.pdfIn PDF document text
    • http://susabumo.atwebpages.com/10460065112.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 4764 bytes
SHA-256: a5ee810f70102fb95b31312f713b106d51f768a250a54e54a4b54ba75d5b77fb
font_01_sfnt_off000129a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A1 11072 bytes
SHA-256: 7ab4508f23f4860c44cd0230ad885ff243197beb7d4f3fefb9b1be1c916ed381
font_02_sfnt_off00014f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F63 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f