Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d222bc3f0e5afca…

MALICIOUS

PDF

80.1 KB Created: 2021-03-23 23:08:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b5e734bbfe79f9286fc7175ce2f6cc42 SHA-1: da5a90ba30eb7b8b1fbf1925e45875bd33beb35a SHA-256: 4d222bc3f0e5afca9d9eb4789169a672efbfce2f71dae2106ff488e4db2e4707
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including external URI links to disposable hosting and a high ML classifier score. The primary URL, https://midufefew.ru/award?keyword=ordering+fractions+with+different+denominators+pdf, suggests a phishing or content-luring attempt. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a malicious document, likely distributed via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/award?keyword=ordering+fractions+with+different+denominators+pdf PDF link annotation
    • http://forexgeeks.net/delajeturuxalajudefikdrplp.pdfIn PDF document text
    • http://tiwujatujoput.mygamesonline.org/la_crosse_technology_atomic_clock_setting.pdfIn PDF document text
    • http://vovality.club/how_to_improve_manual_dexterity_for_dentistrysf25g.pdfIn PDF document text
    • http://twenty-promo2020.ru/nutrition_care_process_and_model_part_1_the_2008_updateqzw9g.pdfIn PDF document text
    • https://cdn.sqhk.co/zopimoforaja/gjkjhja/tuxezikixufitumoketewomo.pdfIn PDF document text
    • http://hisgohar.site/gixeraovns2.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/sewomupejoxiteniralr6heu.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/castle_of_glass_sheet_music.pdfIn PDF document text
    • http://submonster.xyz/67335433425fyxoi.pdfIn PDF document text
    • http://bigpleasure.ru/how_to_write_a_health_and_wellness_plangozav.pdfIn PDF document text
    • http://russianpatentexpert.com/25315229300h7ryi.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/dixeworunowolulitab.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/ihcicja/history_of_south_asia_timeline.pdfIn PDF document text
    • https://cdn.sqhk.co/sojetaji/iQjajbB/cat_game_the_cats_collector_hack.pdfIn PDF document text
    • http://wow50.pro/samsung_dw80j3020us_parts_canada29jqi.pdfIn PDF document text
    • http://kernig.pro/10419774119qxqbo.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/dijipirubik.pdfIn PDF document text
    • http://pedaxofanor.mywebcommunity.org/motufobebonila.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mejifavo/cavernous_malformation_vs_avm.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/kopujomapoza.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/how_to_set_up_schwinn_ic4_bluetooth.pdfIn PDF document text
    • http://kuwijiti.myartsonline.com/what_is_the_importance_of_cleavage_in_development.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_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 5656 bytes
SHA-256: 171cc525c4ce8b60e4c9a5723dd63bc0a7db39f7453d3dc8f47bae40517628cf
font_01_sfnt_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 4540 bytes
SHA-256: bb3dc4794b2aa11224f98d8ddc50e6586cfe6e9f77c4a9d49af4484fa400aab2
font_02_sfnt_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 10884 bytes
SHA-256: aae02ec2742ee25ac56942296b62e48d8beb7b605783ac85d35b5b1b242042a7

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