Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d7b27f2c4d01e2…

MALICIOUS

PDF

81.6 KB Created: 2021-02-15 19:52:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 405a72f801bb052258becf69bb806d37 SHA-1: 8a873c084aee3cf04e142d92e1fa336f9908b2c1 SHA-256: a5d7b27f2c4d01e2e0cc258e8c1d750e07b7c8dfd2d2658f4acbc88276a40aff
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body contains text related to stock exchange queries, and embedded links point to various domains, one of which is identified as a link farm on disposable hosting. The primary malicious URL is likely https://seumenha.ru/123?utm_term=why+is+stock+exchange+closed+today, which is presented as a search result. No scripts were extracted, but the PDF structure and embedded links suggest a phishing or 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://seumenha.ru/123?utm_term=why+is+stock+exchange+closed+today PDF link annotation
    • http://kukushka.space/powerpoint_presentation_templates_free_educationsqpib.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/BBgjijI/stock_market_simulator_no_sign_up.pdfIn PDF document text
    • http://rirelavemug.iblogger.org/17188794090.pdfIn PDF document text
    • http://deemonatrafik.xyz/31606193738t1xau.pdfIn PDF document text
    • https://cdn.sqhk.co/lexelinowe/d67jcjf/weather_forecast_islamnagar_budaun.pdfIn PDF document text
    • http://gratoraama.website/prehistoric_park_builder_hack_apk_downloadr4ofy.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/fiiaiie/vitalsource_bookshelf_app_keeps_crashing.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/MgiAcja/global_warming_solutions_act.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/1Fpicje/answer_to_4_pic_1_word_daily_puzzle.pdfIn PDF document text
    • http://private-channel.site/kepepev8uqm5.pdfIn PDF document text
    • http://nigasheff.xyz/surupoztptf.pdfIn PDF document text
    • http://enots.space/buripadokrsfk.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/ghgNicS/rararijewuwazokototiku.pdfIn PDF document text
    • https://cdn.sqhk.co/sezabaxo/Egfhc7J/32965243778.pdfIn PDF document text
    • http://mmmuuuue.space/huawei_health_app_not_working_after_updateza10i.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://rujemivegelap.epizy.com/38919844424.pdfIn PDF document text
    • http://tejizikadojuni.epizy.com/best_fishing_guide_galveston_bay.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/ditukatokof.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/bombay_movie_instrumental_songs_free.pdfIn PDF document text
    • http://madulisi.epizy.com/twitter_video_indirme_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/18747307129.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_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 5140 bytes
SHA-256: fdb34b21d02f9162d2f25987cfca6a6c9f20c3bc48725b85754b5eca967e5761
font_01_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 11116 bytes
SHA-256: 9bfaf0d7e070e13a4cd761861ac584345ffe994859e899fcdda9e1fe12b94050
font_02_sfnt_off00012aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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