Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0213751d7762f2…

MALICIOUS

PDF

75.6 KB Created: 2021-03-30 09:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2cd0041d76d4b6453a42328c3c94b91d SHA-1: 7aab02733927bbf7123a0a6d914dc6925c58e114 SHA-256: 4f0213751d7762f2b2982b23cd56d5845e81126493709b6b3ec626c3e6639991
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute further malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/award?keyword=alcohols+and+phenols+pdf PDF link annotation
    • https://cdn.sqhk.co/xizefonuma/bjdXxia/grammar_school_test_papers_with_answers_gloucestershire.pdfIn PDF document text
    • https://xexifenenufomag.weebly.com/uploads/1/3/6/0/136082553/6879178.pdfIn PDF document text
    • https://kuritemu.weebly.com/uploads/1/3/1/3/131383398/04c37340.pdfIn PDF document text
    • http://c-advance.space/nimuketanazajugedewivu92pq.pdfIn PDF document text
    • https://tarokomilidifuz.weebly.com/uploads/1/3/1/6/131636676/f2d3c1f.pdfIn PDF document text
    • https://takatika.weebly.com/uploads/1/3/4/6/134605824/wusiwajojinepib-bujawadaza.pdfIn PDF document text
    • https://zasiranel.weebly.com/uploads/1/3/4/5/134507270/7850879.pdfIn PDF document text
    • https://cdn.sqhk.co/dugubupa/dhdyDby/kowemerog.pdfIn PDF document text
    • https://fetozala.weebly.com/uploads/1/3/4/6/134678703/7975861.pdfIn PDF document text
    • http://lg-copyright.com/zukujomevaxebatej1v5lg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wizebefekeb.epizy.com/pomelo_apk_android.pdfIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_f48d57a440234fcd93fe41aa6813e746.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_b90ec0e666ba45548e5b74e9cdfb09cc.pdf?index=trueIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_5b15cd46a6b34f338cf640902657d356.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_23c104d3d2ca4737b7fd3daaf7e50246.pdf?index=trueIn PDF document text
    • http://dejosabo.epizy.com/farmacos_antihipertensivos_y_mecanismo_de_accion.pdfIn PDF document text
    • http://mafilijesov.epizy.com/vanuporafuboxupemuzitirot.pdfIn PDF document text
    • http://tuxugev.epizy.com/cheam_park_farm_uniform_shop.pdfIn PDF document text
    • http://jekowatu.epizy.com/examen_ceneval_exani_ii_contestado.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_off0000ed94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 5136 bytes
SHA-256: bdf2c50cf9c38ad901d71149ab1e568ec81ca183fe7cd62bc719a68f4dcaf631
font_01_sfnt_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 10400 bytes
SHA-256: 5c05c929f91b9e75b59c275f1150de37989233eac9c08fa3a24ac30bfbc9fbab

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