Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ddcfd197ab73da4…

MALICIOUS

PDF

81.3 KB Created: 2021-04-04 07:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27238871aa7674f8accd10d0141b3120 SHA-1: d498a368f1d93f42bd2ab3d15753156d5675d34a SHA-256: 1ddcfd197ab73da4b5a6b1f4acc0f7f5912a5a80efb1cf33493b69b9b1839799
96 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. No scripts were extracted, but the presence of embedded URLs and the overall detection profile strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=piggy+lord+of+the+flies+physical+description
    • https://xaruxetadelu.weebly.com/uploads/1/3/4/4/134478950/4341531.pdf
    • http://alcozerox.com/30817174487i60tx.pdf
    • https://cdn-cms.f-static.net/uploads/4464311/normal_5fdb0d323e0b8.pdf
    • https://cdn-cms.f-static.net/uploads/4392470/normal_60133a3521b5b.pdf
    • https://cdn-cms.f-static.net/uploads/4428035/normal_602eedd58ef07.pdf
    • http://top-odejda.com/nuance_power_ocr_multiple_documentsh6f3l.pdf
    • https://wijuluvewez.weebly.com/uploads/1/3/1/4/131437378/revijojexilew_kegufawunijamem_zufot.pdf
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/265226.pdf
    • http://urro-hu.com/laxunisugukaduwibutiwider3vm.pdf
    • https://nitafigiwulizo.weebly.com/uploads/1/3/1/4/131406945/6395739.pdf
    • https://zevuvizaxetu.weebly.com/uploads/1/3/4/8/134887967/tuvelitedodupeda.pdf
    • https://zufesuvagudinaf.weebly.com/uploads/1/3/4/3/134321689/7365a4958.pdf
    • https://cdn-cms.f-static.net/uploads/4501482/normal_6063b71edddd2.pdf
    • https://static.s123-cdn-static.com/uploads/4446492/normal_5ffada823f737.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/783f4106-035c-422c-8666-a65be40b6175/gepenesavibaw.pdf
    • https://s3.amazonaws.com/mefovu/15838221443.pdf
    • https://uploads.strikinglycdn.com/files/127644ac-0389-4fee-8c6e-4d585fd36bdc/dawujilobaselutupudupas.pdf
    • https://s3.amazonaws.com/widuxade/wukuzuze.pdf
    • https://s3.amazonaws.com/gavapozalilup/best_android_app_for_u8_smartwatch.pdf
    • https://s3.amazonaws.com/gozilum/lezuja.pdf
    • https://uploads.strikinglycdn.com/files/4aa6ffea-9be7-4a80-aaf5-c1d56a77737a/93431293234.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff3e.bin
f19e12528e8efd32402bcf80e8fa560b8fb37acdabcaab243adab7dd0687f282
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 5520 bytes
font_01_sfnt_off0001120a.bin
ec05faf951303ca3f92d99424be08deeb55ba9f17074373a7f7f8c45a269e499
pdf-font-stream PDF embedded font (sfnt) at offset 0x1120A 11136 bytes