Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4f77b0e98aa081…

MALICIOUS

PDF

82.3 KB Created: 2021-04-10 15:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 31283a8ecf034592c7b98313604d09b2 SHA-1: ad7faf29b2f3e582b13d9751133e02741302b09a SHA-256: 2d4f77b0e98aa081bc2bdd3a8580050c893f92fb773aed53c47ec9dc87d381d5
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior. While no scripts were extracted, the presence of external URIs suggests the document's primary function is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/strik?utm_term=the+work+of+art+in+the+age+of+mechanical+reproduction+book PDF link annotation
    • https://cdn.sqhk.co/wupifufexix/mUjhihp/1963177932.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://ragulifogikub.weebly.com/uploads/1/3/3/9/133986704/9f808c969ebec71.pdfIn PDF document text
    • http://lessonsonline.site/77602933168bdlqo.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/23859473507.pdfIn PDF document text
    • http://salonapp.xyz/pitovorenifafebakek7x5b.pdfIn PDF document text
    • http://zaxegod.getenjoyment.net/la_crosse_technology_308-146_wireless_color_weather_station.pdfIn PDF document text
    • http://kupivse.xyz/61441331428hosp2.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/ghohgMt/pressure_washer_pump_parts_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/zivudasexoni/U3XMkBK/carga_segura_express.pdfIn PDF document text
    • http://lavka-karamel.ru/80719165304i1hrc.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/philadelphia_map.pdfIn PDF document text
    • https://netukilegulises.weebly.com/uploads/1/3/1/6/131606016/ae2685288d441.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_7c2bfacf74bc407e82529a42ed041984.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/casio_fx-260_solar_calculator_use_online.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/nujojaraniwubobi.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_f2aa4c3408d941a1bdbf31e68f02df3e.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_7083bde14dba4ea78bff5175a5ce08dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukusa/posugubisoralaki.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/99205809236.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/vigefabudixuwogugutaxuv.pdfIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_8c6fbe59d7654961be2bb75ebfd484db.pdf?index=trueIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_3d15acbc689542899d47eb9399bc73b8.pdf?index=trueIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/muxigetefoxugokitezeg.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_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 5636 bytes
SHA-256: 717f44107a80c031312b217d9570a1b3266e5ef7fc819ad4028df9833b4ec297
font_01_sfnt_off00011391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11391 12464 bytes
SHA-256: 57ccd5e2ce12375fd49c344ab5ed5502ccde4c9ba75df7918262e71c2e9ddc68

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