Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a010cbb1c877750…

MALICIOUS

PDF

78.7 KB Created: 2021-03-28 05:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d3a0d6631e34299e7692cf53ec979f5d SHA-1: 1e7916bc543e8d776c739b304fc356d799f47041 SHA-256: 3a010cbb1c8777507369c80748b1f722a69be1f9e3ec618dd64134e26bc5b8ee
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate the PDF is designed as a link farm on disposable hosting, likely to phish users or lead them to malware. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=skyrim+slow+down+time+command In PDF document text
    • https://cdn-cms.f-static.net/uploads/4425009/normal_605c033155219.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/hcwW4mX/71276536330.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391624/normal_5fef4979587db.pdfIn PDF document text
    • http://idealica-ituficiale.website/hitachi_cg22easslp_manual3f5xf.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/litafuxe.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/gIUCChi/real_moto_hack_apk_2019.pdfIn PDF document text
    • https://lasogevedona.weebly.com/uploads/1/3/1/3/131398076/6351965.pdfIn PDF document text
    • https://cdn.sqhk.co/lolatonuvesa/gicG2sj/azur_lane_leveling_guide.pdfIn PDF document text
    • http://adyga.site/loan_calculation_sheet_excelmokhx.pdfIn PDF document text
    • http://bluebadge-support.com/creed_2_russian_translations7pih.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451206/normal_5fe15d4180235.pdfIn PDF document text
    • http://rte-ita.fun/bugelusiwevonrxc8t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467975/normal_602a8a311b2ef.pdfIn PDF document text
    • http://fragcups.com/candy_crush_apk_android_152l3j.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/gi7Neih/hills_of_steel_mod_apk_2._2._0.pdfIn PDF document text
    • https://jexesatarufo.weebly.com/uploads/1/3/1/4/131437655/jadejoxojeve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipanokule.onlinewebshop.net/16432663159.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/puxujolibezevutisa.pdfIn PDF document text
    • http://dowafirowelumex.atwebpages.com/biblia_reina_valera_para_android.pdfIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/19450902519.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/29922860371.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_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 5448 bytes
SHA-256: 342228aa58322f99499a2952bef44d4096a0ad8543849d6a152cd6ba4d9b38f0
font_01_sfnt_off0001076d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 11164 bytes
SHA-256: acdf2714c870da5f10ac8ddea75c916dbf355ad4ed87c997d0efe55e19724680

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