Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9a9f613d363896…

MALICIOUS

PDF

113.6 KB Created: 2021-03-31 10:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 26ef968bb0d1049092ad46d61a2059fb SHA-1: 35fbaf8507a63563f92b2be4c0ac8c4f3be1518a SHA-256: 3f9a9f613d363896a33d0523b773d9c8676a9ba03a6361ee21563897f411ec03
156 Risk Score

Malware Insights

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

The sample is a PDF containing numerous external links, many of which point to suspicious domains and are likely part of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document's primary purpose is to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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=median+per+capita+income+us PDF link annotation
    • http://lejifip.sportsontheweb.net/bitributao_e_bis_in_idem.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/tubozovixovajigobedubaju.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/godemadilemuwexegawotuvi.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/argumentao_juridica_em.pdfIn PDF document text
    • http://kalowodopole.mygamesonline.org/nufowewawed.pdfIn PDF document text
    • http://banuduxirodeb.mypressonline.com/95859520128.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/thesis_about_abortion_in_the_philippines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lanubili/radepege.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/58718834419.pdfIn PDF document text
    • http://jalebuvubo.myartsonline.com/wound_care_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/the_standard_hotel_rooftop_los_angeles.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/bacteroides_fragilis_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/manual_icsee_pro.pdfIn PDF document text
    • https://88e92b2d-3ddf-41b2-a2ae-4af48bfba274.filesusr.com/ugd/b74686_d21a03eabd83445e8fed786022371926.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_b11d8a008b0441e3868b3bda47e088b7.pdf?index=trueIn PDF document text
    • http://gavawekib.myartsonline.com/romeo_and_juliet_balcony_scene_script_modern_english.pdfIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_102f56d9e60748d395772aa7d8a5b0a4.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_584b79aefa3f41f2b6de9248eb714907.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovuzize/xobomesos.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/loxagafatodozezafuju.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/xasukemokowosetorajag.pdfIn PDF document text
    • http://robefowoved.onlinewebshop.net/2108769603.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_off00017ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EE4 5192 bytes
SHA-256: fec0cf9f8e4319bc3d6218af0092646266594aa97317d7f00dfd571d193b8206
font_01_sfnt_off0001907d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1907D 12032 bytes
SHA-256: 693c56408f6a90d50092d42baf57eb4a7469f0e08b6e2221cd82c8988e55d47f

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