Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da471122778ec9d…

MALICIOUS

PDF

77.3 KB Created: 2021-02-09 10:53:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5bf47200e359c7624d2561fc81847460 SHA-1: 0cfb4f11240f6a6bb82738686e5c49efb0e00815 SHA-256: 4da471122778ec9d288373b1136a2da679f1760fad8348e9c0959b5b489ac834
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 0.9998

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://baarspo.ru/aws?utm_term=academic+ielts+writing+task+1+sample+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408865/normal_601d58edf29a5.pdfIn PDF document text
    • http://welutotadaxol.iblogger.org/tepizaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_6021785d348f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503578/normal_5fff502ff104f.pdfIn PDF document text
    • http://ruxuruweluwi.iblogger.org/maharashtra_census_2011_in_marathi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479223/normal_5fc8ee39d227e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485321/normal_5ffa33571390f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462374/normal_601cb2dcc905c.pdfIn PDF document text
    • https://giderolimarova.weebly.com/uploads/1/3/4/0/134098849/5d85b91e8808f5.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://s3.amazonaws.com/vavapekadoliti/ace_ventura_the_cd-_rom_game.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/nemitowuwem.pdfIn PDF document text
    • http://riramemixezu.epizy.com/excel_index_match_another_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/qld_tv_guide_wide_bay.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/predicting_ionic_charges_worksheet_answers.pdfIn PDF document text
    • http://likifekedita.epizy.com/wopemozuwenonetesoroki.pdfIn PDF document text
    • http://favavobebin.epizy.com/pegolirigujoki.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/adobe_audition_1._5_with_crack_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 5268 bytes
SHA-256: a0e5813a78401521e3a0de275838971950f09d1d36c678dd5e15223749cabab1
font_01_sfnt_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 11292 bytes
SHA-256: 365397b982f239e0e3cc8bda79921366c4c052490c8fda2bfe6755c4bfc87d3b
font_02_sfnt_off0001198c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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