Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cae30521f8270c…

MALICIOUS

PDF

79.6 KB Created: 2021-03-25 16:10:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4ea0261ece71c556b015e29f3cecba56 SHA-1: d46067ec61cf46e1eb94627dfd0899794fa8340c SHA-256: 66cae30521f8270c890c4813d42e5192b14fe8737e7ae6777b1e9bf277b164a6
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/123?utm_term=bamini+tamil+font+layout+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411922/normal_6021ccafd61b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365584/normal_5ffcc4218e0ed.pdfIn PDF document text
    • https://naruvemekojesez.weebly.com/uploads/1/3/4/6/134685524/taxojagos_jurapolazapivad_tiruwobixoja.pdfIn PDF document text
    • https://bixoriwapavam.weebly.com/uploads/1/3/4/7/134731951/gimap_feropov_voguj.pdfIn PDF document text
    • http://prequester.online/78018068577fmj0h.pdfIn PDF document text
    • https://xolesozetenosox.weebly.com/uploads/1/3/1/0/131070434/ee34064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403129/normal_604fa4a138f61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423462/normal_5ffbacbd0df8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383561/normal_601381efa6530.pdfIn PDF document text
    • http://hookup153.site/84509747083mx4xu.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/jiwotarotavuz/57575574786.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/agrarian_reform_beneficiaries_philippines.pdfIn PDF document text
    • https://9f1be152-2ea1-4306-981d-bfff62ad382d.filesusr.com/ugd/08fb22_6d88ca84e41e408a925f83919b45d4c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/65016789468.pdfIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_f9972684aa4a4ce1965d4f569d7f600d.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_a37ed79db7764817bf22debe415a3c6f.pdf?index=trueIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_9fb53f2e3b094b6a98c5b631fa0af369.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/65972976802.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_7b85615e09da4c588a8780bcc9c94474.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvazi/labokonizezatixagu.pdfIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_05c466dc892b4a86b23642af604c634a.pdf?index=trueIn PDF document text
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_d9035afc075b410c9531c48bbb30fa5e.pdf?index=trueIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_1c5affbc761e4c0793910cc2e0273087.pdf?index=trueIn 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_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 5064 bytes
SHA-256: 8f980a0bc2f8e81b0fe65a0b7937906cd63b10c5c7daf65efd038ffb111b00a6
font_01_sfnt_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 12728 bytes
SHA-256: bc94fa322ad609afb3a5d648afc1a89bab327eb5a81e968c1f5b8a18319ace11

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