Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8393f7ad765836…

MALICIOUS

PDF

79.6 KB Created: 2021-03-11 07:42:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b97237dee09338cc5828c0ff4c6ab09d SHA-1: e14ef75196eded5f9f3d6ea398958ce3f35df72f SHA-256: 4c8393f7ad7658367d126a204bc018cf94bd9bfdb7583cf8926bff9e11990a68
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 trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to reference software names, suggesting a lure to download or install malware disguised as legitimate software.

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://nipisod.ru/wix?keyword=dr+web+security+space+life+apk+12.5.1 PDF link annotation
    • http://mexicotop3.xyz/easy_battery_saver_for_androidx6281.pdfIn PDF document text
    • http://secureappeal.com/the_monologue_audition_karen_kohlhaas57bzu.pdfIn PDF document text
    • http://myyshooop227.site/what_is_the_difference_between_agile_scrum_and_kanban4kupz.pdfIn PDF document text
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/xivew-fovivodojuw-vapavedifodi-pokep.pdfIn PDF document text
    • http://olymptrade.buzz/rs_aggarwal_maths_textbook_class_8_free_downloadsizbu.pdfIn PDF document text
    • http://pukebebizadolu.mypressonline.com/23722024946.pdfIn PDF document text
    • https://sokexeziboril.weebly.com/uploads/1/3/4/9/134902232/pavewibexij.pdfIn PDF document text
    • https://lupirolawa.weebly.com/uploads/1/3/1/4/131453436/8694961.pdfIn PDF document text
    • http://tk-pobeda.site/21505759015061z1.pdfIn PDF document text
    • http://olivamebel.com/22109221825p884h.pdfIn PDF document text
    • https://vumazilizulorap.weebly.com/uploads/1/3/5/3/135300666/kemaj_nuvaru_fenisa_dadigiro.pdfIn PDF document text
    • http://zumanidoxup.medianewsonline.com/77127655781.pdfIn PDF document text
    • http://juzezudusota.mypressonline.com/easiest_way_to_learn_autocad_electrical.pdfIn PDF document text
    • http://glawerry.online/dioses_y_hroes_dela_mitologa_griega_ana_mara_shua8d6or.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/taleemi_calendar_2020_20_punjab_download.pdfIn PDF document text
    • http://larokamexi.sportsontheweb.net/fugili.pdfIn PDF document text
    • https://neveloso.weebly.com/uploads/1/3/1/4/131408616/kekenetavetabez.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/streetcar_named_desire_movie_ending.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/allen_pre_medical_test_series.pdfIn PDF document text
    • http://reladefuxuna.onlinewebshop.net/lokejopejopusewo.pdfIn PDF document text
    • http://bitines.myartsonline.com/77921163280.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/xuderimodega.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/94509761729.pdfIn PDF document text
    • http://kuxemozoxabonag.onlinewebshop.net/46286319852.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/casio_fx-9750gii_instructions.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_off0000fa8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 5744 bytes
SHA-256: 95a807d7caf3320d66c4326ed941085b2d76c9d03c9ea0611dd65216a1e90b14
font_01_sfnt_off00010e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 10108 bytes
SHA-256: f3432fd8dc63d1366e6f219bb1f582f6fb3fe143f7f31115324dfdd8e8992cdf

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