Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4f933cecc45db0…

MALICIOUS

PDF

75.6 KB Created: 2021-04-01 02:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: abde6ec0c76a1a8f6f225e2d7bbcce18 SHA-1: a38a113643fdd6d2a252199cdc038b1ea35eedd4 SHA-256: 0a4f933cecc45db09d1c4c4bc5f4126ea5ad6f73a35f9540d03e78e36899a006
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to potentially malicious domains, indicating an attempt to redirect users to harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm designed to distribute malware or facilitate phishing.

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://druttle.ru/award?keyword=introduction+to+entrepreneurship+and+innovation+pdf PDF link annotation
    • http://trysalon.xyz/xukakuxakobnfzjw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447253/normal_5fd370815186d.pdfIn PDF document text
    • https://fabavowugofafif.weebly.com/uploads/1/3/4/5/134591931/8609422.pdfIn PDF document text
    • https://weruvuwixaxo.weebly.com/uploads/1/3/5/9/135972833/vowotebememaganego.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/7306687c.pdfIn PDF document text
    • http://nesobaka7.xyz/turipamigikujagu63quf.pdfIn PDF document text
    • https://cdn.sqhk.co/xiponamoribo/XNjfihv/lojinupagujabebupevutif.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/hhdjjgc/nusipuzawezikiruwenomi.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/epheQij/2337160062.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388046/normal_5fc826f62cd07.pdfIn PDF document text
    • http://callup.today/68525646619wf22e.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/gh7hjhd/gureriwegiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502906/normal_605fa466ac395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c07a07-192b-4748-bcef-b76ad98f8222/troy_bilt_pony_mower_deck_belt_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf5ef08-b657-4eee-b30e-d943878b9b59/build_my_life_housefires_chords_and_lyrics.pdfIn PDF document text
    • http://davaroka.rf.gd/how_to_install_netgear_ex3700.pdfIn PDF document text
    • http://luwidegudaje.epizy.com/73889726975.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_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 5208 bytes
SHA-256: 8227aa22a25fb37534b509a60275002009b32c99f565860c1fdea7073abf7810
font_01_sfnt_off0000fde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 10320 bytes
SHA-256: 8ec4f4d2f2baa3f94ebac8c10bce2c6e3c2f15b76482f64239be1798862258c6

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