Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e1b072d5b1ba5b…

MALICIOUS

PDF

76.4 KB Created: 2021-03-28 10:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b8529f821493ece717ecd72578c3c852 SHA-1: 72d2054f40db09677584a29ccab32f0daf09471e SHA-256: c1e1b072d5b1ba5b4c48215a5efe94d4aa1a2aa608bb7e4f5301e9eb5c026794
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

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://gimoguvi.ru/strik?utm_term=microsoft+flight+simulator+x+steam+vr PDF link annotation
    • http://shtangye.xyz/56249831923xvskj.pdfIn PDF document text
    • http://verifybadgesbusiness.com/atresia_biliar_congenitaic7rv.pdfIn PDF document text
    • http://botanilix.mygamesonline.org/94269535254.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379731/normal_5fc604c7173d2.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/KiihED1/daledezuralekikidoget.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/ddgvChc/jewish_history_month_uk.pdfIn PDF document text
    • http://dusejetiwogodad.getenjoyment.net/98693258070.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/the_architecture_student_s_handbook_of_professional_practice_15th_edition.pdfIn PDF document text
    • http://monoga.space/blade_inductrix_fpv_hd3dm5v.pdfIn PDF document text
    • http://sobakin.space/67641606521we6zo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366347/normal_6002df1507903.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/hhp9Y3i/54332298016.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/ifqoEa8/grandparents_gift_ideas_for_christmas.pdfIn PDF document text
    • https://cdn.sqhk.co/ribuwikoli/rjlhaxC/antonyms_dictionary_apk.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/e606c827-6ddb-4e93-8240-3a2967e1c4b7/zaxoranuvupobalovevofadol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf2660b-f11b-4f6e-9df2-89efe4d81267/jurojesurugopapubolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9875da5b-7bb0-407e-9cca-5b7bcf700df8/jorimiwatasuwiwa.pdfIn PDF document text
    • http://gozidonozali.myartsonline.com/wetevolaburex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd44f4c-5932-4cfb-aaef-71e525164b59/73256458792.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_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 5428 bytes
SHA-256: d6a78f9c5647e22c3cada812b13d561731f7b055622ff51017cbfb389ee326d4
font_01_sfnt_off0000fe47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE47 11308 bytes
SHA-256: eed6fd04f5f93eefccea76e6f6e858b291eaa10ebc95334cb105ee9c5ab32df3

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