Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b8e1c9fe40da01…

MALICIOUS

PDF

80.1 KB Created: 2021-04-05 03:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 00131701eb2c0f903f3c9fe800125dbe SHA-1: 998f5c85a2ff80d4bf165425ba0c739306df2de7 SHA-256: 43b8e1c9fe40da01750d43aae31a870950d0c7668761375fa268809cfc95ffc0
126 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 PDF contains numerous embedded URLs, with one identified as a link farm on disposable hosting, suggesting an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://roburupagosode.iblogger.org/advanced_actionscript_3._0_design_patterns.pdf In PDF document text
    • https://jerisiliv.weebly.com/uploads/1/3/5/3/135314768/xewutomafa.pdfIn PDF document text
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/kiwepilibevirituf.pdfIn PDF document text
    • http://muparizuxufuxud.22web.org/kho_kho_score_sheet_2018.pdfIn PDF document text
    • http://japarof.mywebcommunity.org/73061652316.pdfIn PDF document text
    • http://hdsamara.ru/relion_prime_control_solution8ms9b.pdfIn PDF document text
    • http://vewazovowev.iblogger.org/nombres_de_dios_en_arameo_y_su_significado.pdfIn PDF document text
    • http://naturfresh.space/598795947546byam.pdfIn PDF document text
    • http://zovolexune.sportsontheweb.net/administracion_para_la_calidad_total.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/vejibetawanabegivawerope.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/919b82ed6b9.pdfIn PDF document text
    • https://zojobowexiwe.weebly.com/uploads/1/3/1/3/131380894/48447.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/kMuynZNWtA0/wb?keyword=does%20collagen%20help%20lose%20belly%20fatPDF link annotation
    • https://s3.amazonaws.com/fizup/biological_classification_class_11_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/170a1faf-589d-4971-82ce-0b342d946663/how_to_fix_kenmore_washer_leaking_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ed25ed-f86c-4a3a-ba0e-f073eaa3bb5a/fenomenologia_del_espiritu_frases.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/vusuxapo.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_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 5424 bytes
SHA-256: e83932376fad4ccdcdabf50e6d0c3212f9573593638efb12af107fd59f18cb9b
font_01_sfnt_off00010d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4E 11212 bytes
SHA-256: ff34c26dbb2e741ab9737a1af36c9efac7d35ad5c19f08c42b3d21f35023c852

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