Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff4cfe7fcf30928…

MALICIOUS

PDF

77.1 KB Created: 2021-04-17 23:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5f837e048a65a53e459f2b6c40b3e4b6 SHA-1: 74d2d9af56557f814be6b1632f189a03bf7853a5 SHA-256: 5ff4cfe7fcf30928c7a31cfe8ccebdd0a3f3cdf845eafb885e417b871ea828c2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and a potential phishing/malware distribution vector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain keywords related to product listings, reinforcing the lure. The presence of external URIs suggests the document is designed to redirect users to malicious sites.

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://resalured.ru/strik?utm_term=fender+blues+deluxe+reissue+amp PDF link annotation
    • http://thedefenseforge.com/medios_de_produccion_estructura_economicaqw9sv.pdfIn PDF document text
    • http://podipotekoi.ru/pikokedibetomuwejn9lkx.pdfIn PDF document text
    • http://lojasamericanasbr.com/26901880332eas6z.pdfIn PDF document text
    • https://cdn.sqhk.co/pojizurigos/D9ifhe6/lofatikotamagogekomowape.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373508/normal_5ffd1fbd709af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493221/normal_6039e6ea3d9cf.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/bheaqhd/kubarexogaguboziteluxoda.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/gh5hgly/wovesebugite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390661/normal_606045707a6fd.pdfIn PDF document text
    • http://onlajn-kassa.ru/mugijelimupegikovqhcxb.pdfIn PDF document text
    • http://ruroraratotu.66ghz.com/6602288594.pdfIn PDF document text
    • http://davebamonuzove.medianewsonline.com/wudonajofomisif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414701/normal_6033a9d5bda29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_744160b0199b4917aba4b355707a9929.pdf?index=trueIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_be87a431b8fe42609f7a4ffd5164b69a.pdf?index=trueIn PDF document text
    • http://duvodix.myartsonline.com/95705145650.pdfIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_8d0d948aebee4045982c10574cf67847.pdf?index=trueIn PDF document text
    • http://wafovekideg.rf.gd/who_has_the_best_refinance_rates_right_now.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_15c0e5979247445dafc72cea1fc8dae0.pdf?index=trueIn PDF document text
    • http://bevamezorivu.rf.gd/auto_aceitao_psicologia.pdfIn PDF document text
    • http://feladomiforokek.rf.gd/admin_staff_job_description.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_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 5268 bytes
SHA-256: 7bd7fcf29934a2437aa9470f9b8f01fff4326f5080e557523cb4fb5841dafc98
font_01_sfnt_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 11816 bytes
SHA-256: 957e23ea02206f42710c6e06c94e2cbbd54ec8402bf4307aea886ed1e13f638b

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