Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a22552de512b2b…

MALICIOUS

PDF

92.1 KB Created: 2021-03-26 07:22:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2db334b55156a5c33d30d4e02f7eca2c SHA-1: 82d5a2e9d28ae50bd3e0b15f010a14a06f557b73 SHA-256: 66a22552de512b2be57c86ee51d2b2573ac4d7b64c7d938e549251188aa884a7
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The embedded URL 'https://nipisod.ru/wix?keyword=1450+to+1750+ap+world+history+timeline' suggests a lure related to educational content, likely to trick users into visiting a malicious site. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://nipisod.ru/wix?keyword=1450+to+1750+ap+world+history+timeline PDF link annotation
    • https://cdn.sqhk.co/durotula/ghihgfd/driving_school_classics_hack_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/ZR7ICtP/zombie_raiders_survival.pdfIn PDF document text
    • https://cdn.sqhk.co/lowilufape/bjiligc/pe_lesson_plan_free_template.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/chhhjSY/bekezijajuzerezisuzinet.pdfIn PDF document text
    • http://kufejat.sportsontheweb.net/broken_wings_book_free_download.pdfIn PDF document text
    • http://waliduv.mypressonline.com/water_prevention_and_control_of_pollution_act_1981.pdfIn PDF document text
    • http://foripekomufotir.mypressonline.com/soligusikirodeg.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/iaidihk/62169042385.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/jbuhcdZ/39644387383.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/the_shah_abbas_milani_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/1Zjfjh5/hotel_ff_e_checklist.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/hguyica/blue_moon_pizza_norwell.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://vilepobafomunow.atwebpages.com/lukerowudulabefob.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/31710162624.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/functional_groups_table_in_organic_chemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/13068185343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90a85702-eb93-49e0-9612-0cdd3e80cb7d/66724163911.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/zufaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd4c98f-340d-4498-9a2f-c507a757634c/kepagemunefedibud.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/aceableagent_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/lozugofigazofem.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/tomibixogidoximono.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE58 5572 bytes
SHA-256: e7112edf5e58e588f8f3e9a77f38e588e24dfa3fc27d855dd5239a4ddbf8f491
font_01_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 1716 bytes
SHA-256: d0f49cc195c1bf31025e9f0e2a1c0016543c567966f58b7536460b272fcd7c9a
font_02_sfnt_off000119bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 10780 bytes
SHA-256: 99a7a756c733be4063abff44104c42b56efb3b102f07a476f5abb6e722ee9bf7
font_03_sfnt_off00013ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBC 16116 bytes
SHA-256: afbdbd02dec82d9be1e07df9ab92004d6e2996c86bdcb9c83a2c1f8ac0d08daa
font_04_sfnt_off00015396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15396 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3