Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b2655b731c53a1…

MALICIOUS

PDF

76.2 KB Created: 2021-02-25 18:30:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f724275ce2ae76cc76daa9da6da4cb56 SHA-1: fca7e77c4cf6440b3721c8907362472c929dd105 SHA-256: b4b2655b731c53a1be46e5165fe4e1a28c6a1675ea317afc78aff2d44af51c6d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. One of the primary URLs, 'https://jacksth.ru/award?keyword=ultimate+diet+2.0', indicates a lure related to diet programs, likely to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://jacksth.ru/award?keyword=ultimate+diet+2.0 PDF link annotation
    • http://jojidasusesot.sportsontheweb.net/probability_tree_diagram_worksheet_easy.pdfIn PDF document text
    • https://gegixigozazewit.weebly.com/uploads/1/3/4/8/134858275/657d997.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/88027102711.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/whirlpool_gold_fridge_filter_reset.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/what_is_the_concept_of_landscape_planning.pdfIn PDF document text
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/4059239.pdfIn PDF document text
    • https://gibexiwufanoti.weebly.com/uploads/1/3/6/0/136099712/judiwigik.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/qjghiGh/metal_pay_stock_price.pdfIn PDF document text
    • https://cdn.sqhk.co/mobixipotex/zhajgb6/city_harvest_church_live.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/22932112690.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/iiyiiM3/baby_twins_game_box_fun_babsys.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabenejajoko.myartsonline.com/soundcraft_ui24r_manual_cz.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/23089852968.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/how_to_find_each_interior_angle_of_a_regular_polygon.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/sezavebovelisesufekaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/mebuxivutaxekuki.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/32679986484.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/14552737810.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/free_bachelorette_party_scavenger_hunt_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/vocabulary_worksheet_for_esl_students.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_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 4992 bytes
SHA-256: 41f7a88e5bad905f54d164a29eece9676a9af0716cffb66dbca752f6273a7138
font_01_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 10364 bytes
SHA-256: f204dbd978467f30df1ffd9d2471ed848ad9d5917d196166fb74852be1bec2e4

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