Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c669a0d6bece3f…

MALICIOUS

PDF

75.0 KB Created: 2021-04-02 15:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8b9b3a42b4148f1c905013a37be5d622 SHA-1: 69f2390ad405279a72eab412ad8263c4f442558f SHA-256: 99c669a0d6bece3f706705e52b48e2ba223abeeb64d69b5a146ef5c7d50e0dcb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, some of which are part of a link farm hosted on disposable domains, suggesting an attempt to distribute malicious content or phish for information. The presence of external URIs and the overall structure point towards a malicious document designed to deceive users.

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 https://jottigo.ru/award?keyword=online+reading+pdf+urdu+books PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444096/normal_6042c9eccb49c.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/ijhcjhx/general_electric_customer_service_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/pojizurigos/3ghqGii/burezikuxijo.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/ijWibbZ/rocket_car_ball_mod_apk_android.pdfIn PDF document text
    • http://javatow.22web.org/minenavifenikodori.pdfIn PDF document text
    • http://xejevojesinil.22web.org/hec_lat_test_july_2019_answer_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_605b5f0046dbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://solatilexi.epizy.com/what_is_the_natural_boundary_between_france_and_spain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d94496e8-f764-476f-a2c4-d63a7aa651cf/xabekuxexagu.pdfIn PDF document text
    • http://zujakogi.onlinewebshop.net/tratamiento_nutricional_para_varices_esofagicas.pdfIn PDF document text
    • http://jupefavasareje.rf.gd/xevusibig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2bd1265-e88e-4572-a8c4-648d43e8c0c6/vugudasuguni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eedb063f-c3f6-46f5-a398-b41e07bd0c8b/yale-brown_obsessive_compulsive_scale_y-bocs_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d21fe174-2534-4c14-82be-8901f6939b5a/ff7_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76082fd8-4d40-4c96-9c34-a69cbef25f72/4756425264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76c981ee-8004-46ea-a9b7-dbfc6258b550/feliz_navidad_translation_portuguese.pdfIn PDF document text
    • http://jubogaju.atwebpages.com/samsung_c460_waste_toner_container.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_off0000e8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 5440 bytes
SHA-256: 3837164e10287bc73ce466d8358cb18b2df0155a3c032c15878d5f065a6d5f66
font_01_sfnt_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 10508 bytes
SHA-256: 4212e6e4d9c3470d8f39f9c2d5d0b20da77a1b2a27d3237f94c5c2ddac8f7d48

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