Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d8cd0b8c0c301f…

MALICIOUS

PDF

75.8 KB Created: 2021-04-07 06:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 40a1974f0d183d624a99f097a37e9478 SHA-1: 0ef83ede0df28e1ef63d0df1191fe324a93182e4 SHA-256: 12d8cd0b8c0c301f2c2d40d6051cc6988ee90d05a4556ba954658b1b92a07f61
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI pointing to zajinet.ru, which is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, suggests a lure related to Excel formulas, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/123?utm_term=afficher+formule+excel+2013 PDF link annotation
    • http://xojuxelase.medianewsonline.com/vatur.pdfIn PDF document text
    • http://fuwefepor.iblogger.org/android_authority_oneplus_6.pdfIn PDF document text
    • http://gudutisiluzew.mypressonline.com/what_are_the_main_criticisms_of_humanistic_psychology.pdfIn PDF document text
    • http://gazedalepi.sportsontheweb.net/learn_english_notes.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/sazozigosaranejezade.pdfIn PDF document text
    • http://solasaxutegi.iblogger.org/30930494932.pdfIn PDF document text
    • http://kodepovorivapi.mygamesonline.org/detusaw.pdfIn PDF document text
    • http://jifarobajis.sportsontheweb.net/understanding_and_using_english_grammar_4th_edition_workbook.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/pawotulegisu.pdfIn PDF document text
    • http://mimivamefigupe.sportsontheweb.net/landforms_worksheets_in_spanish.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/12e98f20-92a2-4ec7-beb5-c852cdb7df83/calvinism_vs_arminianism_comparison_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c4612ca-5f31-48ac-a36e-fcbb66545c75/97700853899.pdfIn PDF document text
    • http://fizusosikirizi.epizy.com/224911887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4cd0f56-09a3-4fa0-a6cb-8b2ae6f7a6d0/twilight_breaking_dawn_part_2_full_movie_online_free_123movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bacd070-da39-467f-9abe-3018e7565816/wixadojifozip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/646a7bc6-7719-4bb2-98b7-1f2b1fc67e26/gosubetesatirabomid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f841643-026f-484f-ad60-ad44c1e09987/edifier_r12u_stereo_computer_bookshelf_speakers_black.pdfIn PDF document text
    • http://zizenatoxu.myartsonline.com/49758665697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e76d6d-b8d6-4435-b619-421adfb4d52c/87331184996.pdfIn PDF document text
    • http://rurogapon.rf.gd/26329538243.pdfIn PDF document text
    • http://tikomiwewo.atwebpages.com/nordyne_furnace_troubleshooting_codes.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_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 5280 bytes
SHA-256: 6fa5cddf2fa47326e85a036a1286a9cb5b0eb4575e1a75c429cba5376fcaf748
font_01_sfnt_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 11908 bytes
SHA-256: d1989202bebb7ff9f7d80a86164e3c5f7f457d2cb26da5ba424b116dabfdc0a3

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