Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ff95284c77d600…

MALICIOUS

PDF

76.3 KB Created: 2021-03-03 10:28:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0dbfda900e348a32937960ea8be31aed SHA-1: b75f2d1d75ff28945df56c17209c6c6ca0c7b3ca SHA-256: c7ff95284c77d60027d0ed49b1b6cbc0a10aa0132c701e86d3df94670fec5888
184 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML models and ClamAV, and contains numerous embedded links to known malicious redirector infrastructure and disposable hosting. The document body is heavily obfuscated, but the presence of embedded links and the heuristic firings strongly suggest a phishing or redirection attack designed to lead users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=california%20common%20core%20standards%20science%202nd%20grade In PDF document text
    • https://cdn.sqhk.co/gefizorabubi/jz4gdha/facebook_messenger_app_for_windows.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/learn_korean_with_bts_book.pdfIn PDF document text
    • http://doordash.fun/diary_planner_template_2019rhv38.pdfIn PDF document text
    • http://vuroxinizona.scienceontheweb.net/can_you_terminate_rental_agreement.pdfIn PDF document text
    • http://marketop.club/68488000679m5g08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450257/normal_60036731de947.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484093/normal_5ffa6e609021f.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/tkggjfC/d_j_music_app_digicel.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/how_do_i_find_my_chinese_name.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_5fe620b4d0162.pdfIn PDF document text
    • http://originalhallyu.com/mudefewejidutijofuxipofins6na8.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/3mibRIQ/77357021052.pdfIn PDF document text
    • http://wekeb.space/one_punch_man_season_2_dvd_release_datecs6ej.pdfIn PDF document text
    • http://kaxiwemusemoj.mypressonline.com/what_period_is_called_the_age_of_reason.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/Njciabs/troll_face_quest_video_games_2_level_31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejufutaz.onlinewebshop.net/resumen_del_libro_tus_zonas_erroneas_capitulo_2.pdfIn PDF document text
    • http://bizedesaxifu.onlinewebshop.net/algebra_lineal_7ma_edicion_stanley_grossman_solucionario.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_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 5376 bytes
SHA-256: e326e45371949383b792dbe6bd1488108d77a112221b785526a9794893b21001
font_01_sfnt_off0000fe23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 10996 bytes
SHA-256: 246bbc63d44a59e6b63ed30d1caa0751c8f83cba6ac3bdb0cca8096053ce098a

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