Malicious PDF — malware analysis report

Static analysis result for SHA-256 509f8e70fdd10f2b…

MALICIOUS

PDF

77.6 KB Created: 2021-03-16 23:25:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d4849de56e3ac5685613a3ed45ec1c31 SHA-1: ab2bbca0262c327fb8fd1ac00c3e1c5a326adfc9 SHA-256: 509f8e70fdd10f2b30abc7bf838e5763e61c830b4de3d678100c7741405f8d5f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to PDF files, suggesting a link farm or redirection strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document is designed to host or link to malicious content, likely for phishing or malware distribution.

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
  • 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://jottigo.ru/123?utm_term=free++mp4+video+player+for+laptop PDF link annotation
    • http://dimozakebaba.scienceontheweb.net/pizogigisesi.pdfIn PDF document text
    • https://cdn.sqhk.co/vifamepupib/CSjfnu4/big_bass_pro_shop_bolingbrook_il.pdfIn PDF document text
    • https://toguvanamevodo.weebly.com/uploads/1/3/4/6/134615804/duligof.pdfIn PDF document text
    • https://rolavakewuxilo.weebly.com/uploads/1/3/1/4/131407047/lutimejerugega_dijuguteselok_guseki_nofufodomumiwo.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/oBghiaE/no_one_escapes_cidhna_mine_bug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478422/normal_6026dfee407f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405202/normal_5fc6305deff9f.pdfIn PDF document text
    • https://gajatizu.weebly.com/uploads/1/3/5/3/135315297/fizoz-sovex-noworibupefok-nazejofinote.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/zurovajij/tapevugixaxitafema.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/80128684541.pdfIn PDF document text
    • http://sivikonalijuto.myartsonline.com/pesquisa_bibliogrfica_e_documental.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_906615ca9e9b484b874d25d0e5f45eaa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutasujal/72948645377.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/student_absenteeism_questionnaire.pdfIn PDF document text
    • http://temolujipu.myartsonline.com/vurabasogexojekiwetuzefo.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_aa06b3d10e754b889046d5fde8135776.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/muwunejafinemekomaj.pdfIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_a0a83d48457744e6ba904c24cb0f65ba.pdf?index=trueIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/difference_between_equity_and_equality_in_education.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/godrej_infotech_aptitude_test_questions_and_answers.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_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 5216 bytes
SHA-256: 47924ea256dd0a76e140c1ee6ab9b4cb4b5489e2dfa6ff7478df2a0a32a71d50
font_01_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 11192 bytes
SHA-256: f4de74574a26e05fd23fe2c4fb25da04961c4f3679ea935c0eaff63a30177abb

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