Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14f0666c7724894…

MALICIOUS

PDF

82.3 KB Created: 2021-05-09 01:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1a7740f8a358711330a1d2a136863317 SHA-1: 2711a57fda9e0270aa5f44ad62863da365db412a SHA-256: b14f0666c7724894656faa26a0548ca67ccf5abb8cec7a888376abb111222a70
96 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 an embedded URI pointing to a suspicious domain, likely intended to trick the user into visiting a malicious site. The document body, though heavily obfuscated, appears to contain a lure related to 'discrete mathematics'. No scripts were extracted, but the presence of an external URI and the malware detection strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=what+is+the+hindi+meaning+of+discrete+mathematics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387716/normal_606607f68011d.pdfIn PDF document text
    • http://virujurarajilef.getenjoyment.net/insurance_company_analysis.pdfIn PDF document text
    • http://sudedelanefozuk.66ghz.com/ieee_template_word_2016.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/3925391938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456122/normal_6013c3ad6c107.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/how_to_calibrate_a_scotts_standard_broadcast_spreader.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/how_to_start_pressure_cook_on_instant_pot_duo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8464cdc5-0ac5-4ad5-81d7-f0f13b2a79fa/howard_miller_mantel_clock_value.pdfIn PDF document text
    • http://rowodebifofida.rf.gd/poemas_de_gustavo_adolfo_becquer_rimas.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/37804003382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea22fb75-d696-46c1-9323-e98b28376fcb/sixetokusamakala.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/jetanutijagabatizaje.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/3480293533.pdfIn PDF document text
    • http://zuvuzevo.atwebpages.com/makalah_biota_laut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84630955-3187-47a9-861b-64b78a60338e/la_ciudad_y_los_perros_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159873e4-44e5-488b-8ca7-3637fbec30c6/engineering_drawing_sizes_j.pdfIn PDF document text
    • http://todiwefexoneb.atwebpages.com/vowodulaganarazaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e8d50a-86b5-4033-8aff-84bb301929a4/m-audio_fast_track_pro_4x4_mobile_usb_audio_midi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD8 5416 bytes
SHA-256: 1aacb78e1dc46d9459f75a1dd08fce47ffec21eaeecbacf583968467dd6936ee
font_01_sfnt_off0000f228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 11224 bytes
SHA-256: ec52f2f0a178a4e4eb71a22e6d466be0d74807f7ce311389dbe145dcd92938fd
font_02_sfnt_off00011891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11891 16220 bytes
SHA-256: e71efc34f0088998323cca089a2fa282198424a2f104a1d6f13ea72086374a8f
font_03_sfnt_off00012e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E17 3208 bytes
SHA-256: 109e30c2ccdcc112032f1ffb689b017780ba546853fd19d947e06f88a068000e

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