Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbd4faeb3842496…

MALICIOUS

PDF

69.7 KB Created: 2020-12-21 22:52:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0af02ca3a9b9a84ae0081be7a6324bb4 SHA-1: aadbfd2cd12f3c0bd226eb4b973683715681e8a6 SHA-256: 8bbd4faeb38424964aacf8969d47e61beb898b345839c758183175cd5892ccf7
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 by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be related to 'drawing geometric shapes worksheets', a common lure for educational or utility-themed phishing. No scripts were extracted, but the PDF structure and numerous external URLs indicate a high likelihood of redirecting users to malicious sites.

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://trafffi.ru/aws?utm_term=drawing+geometric+shapes+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412151/normal_5f964aef9d2cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_5fd9f62159b31.pdfIn PDF document text
    • https://todijaxazifaro.weebly.com/uploads/1/3/4/3/134342800/linazinowifumow_jeduxekorolifuj_kabisapizoboga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_5f8f250a2f82a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444623/normal_5fe0dde563a02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464068/normal_5fe0ba11b14be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490375/normal_5fb77a744007b.pdfIn PDF document text
    • https://jezonekapinojel.weebly.com/uploads/1/3/4/6/134619201/8ea4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476150/normal_5fdb1806a8d21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5fa7fddc05152.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d422ce82-4b49-4369-881d-aa383a1e4bfe/everyday_zen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88bba315-8f28-4d4e-baef-53d94f17dc75/zudijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed24fb39-ea12-49fe-86bc-4bdc47a3ac8b/mapum.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_off0000d450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD450 5472 bytes
SHA-256: 6435bb41c450f5b435b8820dd77f71bab289f9bd8d19c1f04d3d28f60ffe09d4
font_01_sfnt_off0000e6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DB 10396 bytes
SHA-256: 4443db697d11d0243be190a14c629fe7c756fc2a99648f96d10adbc2037570b6

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