Malicious PDF — malware analysis report

Static analysis result for SHA-256 df85641479ef2ef9…

MALICIOUS

PDF

83.7 KB Created: 2021-03-25 01:06:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bb9a83c5ec3f913402b8e4060117f5d8 SHA-1: e2cce76bff049bb051504a4b1b38c257c604596e SHA-256: df85641479ef2ef9685afb8c192e73e7c5a23ee8d8615fc7b7976e2fcc65890d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'jottigo.ru', suggesting it's part of a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is a link farm on disposable hosting, designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/award?keyword=simple+business+case+template+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382784/normal_6044ce53668d4.pdfIn PDF document text
    • http://rakukoke.22web.org/rifipitujipusemurole.pdfIn PDF document text
    • http://volulolusawaz.mygamesonline.org/benefits_of_agritourism.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415783/normal_5ff0aa1940899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410986/normal_5fe998075fe84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464056/normal_5fd0983fbec31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450257/normal_603d055c89bcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480904/normal_601bd36b9b6c2.pdfIn PDF document text
    • http://lamawedetuburut.iblogger.org/mepimabemive.pdfIn PDF document text
    • http://lidudopunabiril.22web.org/87796011936.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408340/normal_5fc7fbcb4f9c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467007/normal_600f3b69efe06.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/23855119927.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/tevigotu/can_you_track_an_international_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37119bd3-3a2f-4a51-859c-0330cc91ba03/zamefufaw.pdfIn PDF document text
    • http://miviloliwibo.rf.gd/4273079020.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/gif_bendera_indonesia.pdfIn PDF document text
    • http://tadidej.rf.gd/avery_5160_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/ladies_in_lavender_violin_sheet.pdfIn PDF document text
    • http://defakulid.atwebpages.com/formato_de_certificado_medico_de_buena_salud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef87b12-b02c-411a-ae96-af21e3af27d0/define_software_development_life_cycle_sdlc.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_off00010a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 5448 bytes
SHA-256: 9bfdc6394c37112b8f271eb5328016ecb1777d9b97891fdbe5bc42b6d5f3b058
font_01_sfnt_off00011ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEB 10856 bytes
SHA-256: 96a2740fcf2bbacfa027224db2eaa6286056400e857abf70c2697e44159493c8

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