Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a527e966c63772…

MALICIOUS

PDF

99.8 KB Created: 2021-06-06 22:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 198ad34e16a8e8c16b8e4bb0b7c2dd63 SHA-1: 559aa94e1bd74caa716f264447ae3ebee2e50b05 SHA-256: d5a527e966c63772fe711d240698860faba52bf21131e255b00851cc310d8017
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external URIs, many hosted on disposable domains or link farms, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of external links and the overall heuristic firings point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://maypoin.ru/123?utm_term=honda+cb400f+manual PDF link annotation
    • https://vefupidukubimaz.weebly.com/uploads/1/3/4/5/134597042/1732788.pdfIn PDF document text
    • https://selamosufuk.weebly.com/uploads/1/3/4/4/134463567/lofazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393639/normal_5fd1200a75fd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450257/normal_5ffff5b55ace4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423430/normal_600aca54918a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446400/normal_60018237900b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_6031bfe699add.pdfIn PDF document text
    • https://xurajozut.weebly.com/uploads/1/3/4/3/134371968/b39f261ef061.pdfIn PDF document text
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/fagobewidakifota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388285/normal_6035183db795b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446643/normal_6031822619cbd.pdfIn PDF document text
    • https://datovize.weebly.com/uploads/1/3/4/5/134508179/mitetezulazisaxugi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447884/normal_5ff0ebe58a396.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tozuxexap.pbworks.com/f/37804951421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99daf1cf-bffe-410c-845e-d1d5035d20fd/58050730343.pdfIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144615267/lafugewuduvife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58900f0e-ceea-4a3d-906f-05f9de7a7841/43475860372.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144445101/tamonoretilotovudaxexuwix.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/japadulowo.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/f/how_to_report_attempted_theft.pdfIn PDF document text
    • http://xifatarege.pbworks.com/w/file/fetch/144690477/how_to_make_income_statement_and_balance_sheet_in_excel.pdfIn PDF document text
    • http://fufitiruw.pbworks.com/f/vocabulary_packets_greek_and_latin_roots_unit_1_answer_key.pdfIn PDF document text
    • http://sewafebi.pbworks.com/w/file/fetch/144426363/xobasabobiwukodetaluwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bbe18a1-a1f2-4073-9ebe-b3a3f46c2493/45171988610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c66852-b4df-4f70-b02c-fa8bbc5c1e6c/what_is_the_best_dvd_recorder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb6367dc-5458-4138-b64f-fd639965bbe0/narayana_reddy_forensic_medicine_synopsis_download.pdfIn PDF document text
    • http://fevuxowina.pbworks.com/w/file/fetch/144604944/wexixosekezigi.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_off00014a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A46 5224 bytes
SHA-256: 66fe79872a3778c0b2d40fc436f7b1be656b058e76b8971e3b0a80ab68d8d2bc
font_01_sfnt_off00015c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C01 11148 bytes
SHA-256: 445ccd001bbfcce68f0263833ee03965b5b9f97ef7f5d60f5bc5352b8e076f47