Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83c866e7c3fad1f…

MALICIOUS

PDF

79.5 KB Created: 2021-02-28 13:50:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 27bd7dc14ace4bc13b3968aeaf1cec36 SHA-1: 7669d5e2d3d0a3988bb40e5e6a31773ec65f9733 SHA-256: d83c866e7c3fad1f256a4cd1fa147477ee8ed8f5c19ebc28a1596e070b852b2d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru' and a deceptive document body suggesting it's a guide for nurse practitioners. The presence of multiple disposable hosting domains and link farm characteristics indicates a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://baarspo.ru/123?utm_term=best+drug+guide+for+nurse+practitioners PDF link annotation
    • http://cleaner-inn.club/fifth_edition_character_sheet_app_blood_hunter9tgd0.pdfIn PDF document text
    • http://mkuu.club/25th_wedding_anniversary_card_template6wcnr.pdfIn PDF document text
    • http://nashremont.site/rust_disconnected_connection_attempt8npc3.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/how_to_read_her_body_language_if_she_likes_you.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/what_are_the_financial_baby_steps.pdfIn PDF document text
    • https://cdn.sqhk.co/tixuniwe/aHsuFjY/53558557072.pdfIn PDF document text
    • https://cdn.sqhk.co/dogilijesiwu/iijcjjm/96212988209.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/CiiXDja/38945767687.pdfIn PDF document text
    • https://cdn.sqhk.co/puwupasakej/gduUvjh/horse_riding_tales_ride_with_friends_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/iiu0hih/cool_facts_about_animals_in_the_rainforest.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/jn9Bl7f/illusion_connect_banners.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/zhjkien/zara_larsson_age_lush_life.pdfIn PDF document text
    • http://decideyouself.fun/which_of_the_following_is_not_a_valid_strategy_for_determining_a_transfer_pricevo82i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nosenek.epizy.com/ampex_mm1200_transformer.pdfIn PDF document text
    • http://tiborumaroxotob.rf.gd/autorretrato_sin_mi_descargar.pdfIn PDF document text
    • http://giduzorim.epizy.com/94600703394.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/75855719597.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/what_is_the_conduction_velocity_of_the_human_ulnar_nerve.pdfIn PDF document text
    • http://gikikojumikobep.epizy.com/xafudadukumomipunukevevu.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/tu_eres_digno_de_gloria_gerry_marquez_letra_y_acordes.pdfIn PDF document text
    • http://pujumek.myartsonline.com/how_to_check_coleman_mach_thermostat.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_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 5340 bytes
SHA-256: 5283f8016e89bce2b0b25029917af9d359d28b4a12de383e6dcbedc0a17985d6
font_01_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 10568 bytes
SHA-256: 805fce0467418c8ba10b9088ca11616fa819c1877af8833e256a4a4478471012

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