Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7a51f4bf869563…

MALICIOUS

PDF

90.2 KB Created: 2021-05-27 10:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5862fb473fc97fbe8c5f852f2adb10e8 SHA-1: 0915112a9d7034dec638e2d7a2e398d851b2c896 SHA-256: af7a51f4bf86956380794061d57c84459d5720022096f965d81054074df5e087
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The primary URL, 'https://maypoin.ru/strik?utm_term=berserk+manga+espa%25C3%25B1ol+pdf+descargar', is presented as a download for 'Berserk manga español pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/strik?utm_term=berserk+manga+espa%25C3%25B1ol+pdf+descargar PDF link annotation
    • https://tusigidufamem.weebly.com/uploads/1/3/5/3/135350313/bakalidewumuguf-tanilok-lulagewudaneso-samuxezomaratev.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/pafozotelesofo_kopovuxozude_forepitu_zewuxuzalat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373986/normal_5ff49ce2158e1.pdfIn PDF document text
    • https://lefevelomisowub.weebly.com/uploads/1/3/4/4/134459897/8985108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386837/normal_602ab883a710e.pdfIn PDF document text
    • https://telanadiv.weebly.com/uploads/1/3/4/4/134495792/074082.pdfIn PDF document text
    • https://loxekezipoga.weebly.com/uploads/1/3/4/6/134678149/kesubuwezi_valavi_pabedivut_nafafedizikusim.pdfIn PDF document text
    • https://vusowixaxepuw.weebly.com/uploads/1/3/1/3/131381533/rarefimokaw_zepibobav_laluku_nuratader.pdfIn PDF document text
    • https://jedunaxalow.weebly.com/uploads/1/3/1/6/131606453/ed0210bbc88b.pdfIn PDF document text
    • https://ladulokepalixu.weebly.com/uploads/1/3/4/8/134878898/mojujojakagidaj.pdfIn PDF document text
    • https://lutapusudifo.weebly.com/uploads/1/3/1/0/131070527/kaxulokos.pdfIn PDF document text
    • https://lufosafol.weebly.com/uploads/1/3/0/7/130775677/bedomofijalon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_601a70b432714.pdfIn PDF document text
    • https://tikefukexizuse.weebly.com/uploads/1/3/4/8/134879623/pesapuloziv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391649/normal_6051648feb805.pdfIn PDF document text
    • https://ludatigesoz.weebly.com/uploads/1/3/6/0/136050408/tetufovobazabuvibot.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/miniwubipozuju.pdfIn PDF document text
    • https://rosafuzumago.weebly.com/uploads/1/3/1/8/131857847/topapuwuji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/633a1a3e-34ff-4a16-9a4b-11d0220cac6a/hector_perez_montiel_fisica_2_para_bachilleratos_tecnologicos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d70e1cce-92da-4f34-93ac-3dd860bdc24c/what_to_do_if_my_iphone_7_wont_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be7ab44-fda3-405c-ad53-79fa41b6f0d3/kuzoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/233566a8-e79b-45d7-98d1-2072a993f779/saganuj.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 3768 bytes
SHA-256: 38c3b5e766f8fe060fbb1dc619b7e42209c4122250269ed927ef109ca50b3f64
font_01_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 5460 bytes
SHA-256: f22b20f20bc7c52170c19ebb3159427a195a5b87bd313e3f6bf97bd360a25f27
font_02_sfnt_off00010d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D89 11936 bytes
SHA-256: 6c33cdd8002b0a4135b80fe910fbff5bfffdd47191211ccc11fa031fff0f6847
font_03_sfnt_off000134fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FB 16116 bytes
SHA-256: f8e326b96df6c0457890c6346fd7f60b91beb129051a642dbd03fdf119a21fd7
font_04_sfnt_off000149d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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