Malicious PDF — malware analysis report

Static analysis result for SHA-256 9476b4a443310dd8…

MALICIOUS

PDF

72.7 KB Created: 2021-03-03 03:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 66aff0c934bd62cf073072ca6b9b68df SHA-1: c7f07f0a2766ec6e4447080249fba2b6b80b2b0d SHA-256: 9476b4a443310dd8657b28f23dddb3b8b787e2c86f6aa3bc6237b97694808587
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/123?utm_term=how+to+unclog+a+paper+shredder PDF link annotation
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/1678395.pdfIn PDF document text
    • http://mihetos.xyz/744242989972dbdx.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/kepedotigumux.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/6Dnhege/tennis_clash_3d_apk_download.pdfIn PDF document text
    • http://acgmgroup.ru/command_and_conquer_4_full_gamemnmya.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464524/normal_602e0795643dd.pdfIn PDF document text
    • https://xuxukogizi.weebly.com/uploads/1/3/5/3/135320654/2508d34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446263/normal_600925bc42c76.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/jTNhhgg/21896273467.pdfIn PDF document text
    • http://antonioita.fun/zalisopibevifabijewizex7xjil.pdfIn PDF document text
    • https://cdn.sqhk.co/xumirikebixo/cjgciif/tuzefizotajufupuwogosuji.pdfIn PDF document text
    • http://hallop.xyz/3d_printing_files_formatzcxty.pdfIn PDF document text
    • http://lg-copyrightforms.com/sozuvorakekesopukinidsgq8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepuxep.epizy.com/motorola_t5720_manual_espaol.pdfIn PDF document text
    • http://luzutajezilako.rf.gd/pizititikow.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_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 5388 bytes
SHA-256: 6b652ca7571d9408f743c50ed9fcea25f3c32f686920532eb06657964b95ef66
font_01_sfnt_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 10776 bytes
SHA-256: b39702c12b7bd88ce613200d57c803f06c51d37c5d68b5eee2db965b6096e8a1

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