Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a9df0b4f13cf8a…

MALICIOUS

PDF

58.6 KB Created: 2021-03-29 00:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 66b2d595ea9b41fd3eabc59c84c13e7b SHA-1: c661c1323ad026c734d51418d44e51808e4126e5 SHA-256: 40a9df0b4f13cf8ab37839037708ec503fd3d7a15a25e6bc2fc833049657691e
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to foster parent pay, directing users to a suspicious URL. No scripts were extracted, but the overall structure and link farm behavior suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8642

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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/aws?utm_term=how+much+do+foster+parents+get+paid+in+nassau+county+ny PDF link annotation
    • http://fruitslope.online/wifi_smart_net_camera_price_in_indiaf0goa.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/what_is_an_external_structure_of_a_poemnphgk.pdfIn PDF document text
    • http://gigogon.22web.org/bafawatozafejof.pdfIn PDF document text
    • http://sirefuwodinex.iblogger.org/vexazinodalusopijupagasu.pdfIn PDF document text
    • http://upgrade4me.com/75012961780z7noi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454299/normal_603b6c76b0d59.pdfIn PDF document text
    • http://buylettersonline.com/tica_para_amador_resumen_captulo_9wppld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_6057a90e53cb5.pdfIn PDF document text
    • http://famuxapow.iblogger.org/cafe_formaggio_reviews.pdfIn PDF document text
    • http://opt05.ru/humphrey_visual_field_troubleshootinglxhhl.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/5dd757d5-1160-42e8-9195-c1414490b0c6/diwobusirenej.pdfIn PDF document text
    • http://nedilopasosugop.epizy.com/isoniazida_mecanismo_de_accion.pdfIn PDF document text
    • http://tomokod.rf.gd/atresia_de_coanas_bilateral.pdfIn PDF document text
    • http://mamotupot.rf.gd/36361764143.pdfIn PDF document text
    • http://lexegeverurejeb.rf.gd/54796840194.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/avanset_vce_exam_simulator_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/synthetic_communications_author_guidelines.pdfIn PDF document text
    • http://kisomelug.rf.gd/scripps_spelling_bee_2020_word_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e24c1306-eb07-4e04-9b51-eefe4afa2106/pandoras_star_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90278c72-51ba-410a-a96d-32d13a631b88/hp_laserjet_2100m_toner_cartridge.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/wezozivunovegejiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f007d670-ee39-4a54-9dca-502f4597a9e8/software_architecture_diagram_explained.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 5572 bytes
SHA-256: e504938afc33e3e3aa5f2f88b8c88819364718532aa24bb742173531524f5186

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