Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b9f5e53dbfcb5d…

MALICIOUS

PDF

76.5 KB Created: 2021-04-09 23:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f011a95e87626c4c9161470999d31d53 SHA-1: ea7e58b611f85fe664e402bdedc0670500c77396 SHA-256: f6b9f5e53dbfcb5d0df073f9ba888157915c8fbc52a5b6cc5ddf1d978192d20b
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'nipisod.ru' suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a social engineering attack, likely spearphishing, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=origami+easy+a4+paper+animals PDF link annotation
    • http://biwiroxefamir.mywebcommunity.org/kabbalah_magic_download.pdfIn PDF document text
    • http://govugododuwo.iblogger.org/delonghi_trns0505m_oil_filled_radiator_review.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/sujodojabiwalorubezarikat.pdfIn PDF document text
    • http://girizug.22web.org/great_is_thy_faithfulness_chords_g.pdfIn PDF document text
    • http://kubidojizuw.22web.org/lixupi.pdfIn PDF document text
    • http://jalosus.mygamesonline.org/anatomy_and_physiology_of_ear.pdfIn PDF document text
    • http://surozofawowidom.scienceontheweb.net/bank_exam_syllabus_2020_download.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/cards_against_humanity_cards.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/sefipa/eso_crafting_guide_woodworking.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/longsword_guide_mhw.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/myers_briggs_test_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/annamalai_movie_tamil_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/timeline_of_us_history_poster.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/9575004894.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/mukoniragalubafuzu.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/poxagalisusepusegeved.pdfIn PDF document text
    • http://bekusisit.atwebpages.com/comment_utiliser_un_multimetre_analogique.pdfIn PDF document text
    • http://peledopa.myartsonline.com/45484876835.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/amazon_fire_hd_6_4th_generation_custom_rom.pdfIn PDF document text
    • http://nosudalivuza.epizy.com/40123265115.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/pekatimax.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_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 5356 bytes
SHA-256: e39ff0bd073f0d03bead8427abb8d9b7bec82dd4e14d6a0f80aa218dcb46d28f
font_01_sfnt_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 10556 bytes
SHA-256: 0823c9bd9bf708aef571c38e0477d87de5f054ffcba899c3bf94ffde5f8bb7c5

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