Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1b91c49782460b…

MALICIOUS

PDF

87.6 KB Created: 2021-03-16 21:20:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 78b3af85fd530061866e1c290b914ea2 SHA-1: 5280808fbfd23de65896245584c2be6f8b6829ba SHA-256: ff1b91c49782460b138f8768a76c5d3f08db83229e66f135ff769b402062491b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://ponafet.ru/award?keyword=bemba+language+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414353/normal_60321147d4c74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_6009caa929254.pdfIn PDF document text
    • http://wavesubikuviv.iblogger.org/47523247436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414161/normal_603040069d54b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376629/normal_5ff69f3fe0d23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497638/normal_600e3e27dea2f.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/kuxegu/9649214145.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/35480073659.pdfIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_1c8cb8b222ab4b8e9c92f54e102c2e53.pdf?index=trueIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_5a1922a7957c4147bc82ab9752d64f26.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wurivuve/xinav.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/24678526636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da829610-69de-497a-b2d7-70e70fde8a5e/harry_potter_free_svg.pdfIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_7b1d7ddbb061496298b71ea0c5e1c8f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cabfdda1-419e-4599-a73b-5a968f22cd4b/vibapopozeduvipikiwimon.pdfIn PDF document text
    • http://kumobeba.epizy.com/codehs_python_rainforest_answers.pdfIn PDF document text
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_ae52a777e1664746a1ffd17d7236ef74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/nobuzoxopufar.pdfIn PDF document text
    • http://tapomizo.rf.gd/jatulemudanavadatoxexuvaw.pdfIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_ab152fcb132e449e8f834cfa7dbcd808.pdf?index=trueIn PDF document text
    • http://mizebonemis.rf.gd/nawoveze.pdfIn PDF document text
    • http://veruzixiki.rf.gd/cica_care_silicone_gel_sheet_for_keloid.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_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 5276 bytes
SHA-256: e25050cab798bc9b426cb63f8f5dd9a4e0a84f823bf27184347235078c384497
font_01_sfnt_off00012685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12685 12568 bytes
SHA-256: 9a73e7c86e8b91b76b7729e0870f28a2a538b88dd40820f9404be25c7ca68024

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