Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a4e3399862e1b4…

MALICIOUS

PDF

132.2 KB Created: 2021-03-28 13:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 94a44e430798f62ac0035315401cffd7 SHA-1: fb5d0972360bfc47093bb52a3ea7f0fcbed560f2 SHA-256: e3a4e3399862e1b4de5d1e1be45b95d360ae0d23104b7f840a5c997f6e5097f4
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or conducting phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/award?keyword=base64+encode+decode+pdf PDF link annotation
    • https://sididipukiwe.weebly.com/uploads/1/3/1/3/131398020/5dea6edc045de3.pdfIn PDF document text
    • http://fodelogutejamit.getenjoyment.net/82352026033.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/49180512868.pdfIn PDF document text
    • http://copyright-services-us.com/what_is_religions_role_in_society3vt17.pdfIn PDF document text
    • https://tawozajoruje.weebly.com/uploads/1/3/4/3/134314125/503580.pdfIn PDF document text
    • http://gaxenop.medianewsonline.com/10138714653.pdfIn PDF document text
    • http://liketime.online/vixaviguxos6l089.pdfIn PDF document text
    • https://cdn.sqhk.co/nimotixalulo/gc3YKMZ/the_best_radio_hits_70_80_90.pdfIn PDF document text
    • https://cdn.sqhk.co/bibikodazit/ge9gcii/deadlift_form_check_starting_strength.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/hhbigjc/nixojevuzoge.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/1ghihem/movistar_play_argentina_canales.pdfIn PDF document text
    • http://jozebifovo.22web.org/academy_of_management_and_information_technology_bbsr.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/1183009465.pdfIn PDF document text
    • http://lilozekakotelup.sportsontheweb.net/wulorofuka.pdfIn PDF document text
    • http://saluzoz.iblogger.org/40319872374.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://telatojewoka.epizy.com/the_mystery_of_capital_hernando_de_soto.pdfIn PDF document text
    • http://verovaweroxuxu.epizy.com/27642020756.pdfIn PDF document text
    • http://babokad.epizy.com/wosulo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B02B 5312 bytes
SHA-256: 643e4609df4f86cb522442232b4bb6947fa6b1d0761d35bff9acdcc6e376a609
font_01_sfnt_off0001c259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C259 12960 bytes
SHA-256: 793f66aab4a0df77b80c2d01312ca6c04ffdac4aecefd367e367f48b6e3b2d03
font_02_sfnt_off0001ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE81 16100 bytes
SHA-256: 1d6b87335cc343a59af9f6d575597ef5583e372378092f1815bdd7c12e9b4815

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