Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec992b4f595aaa0…

MALICIOUS

PDF

83.4 KB Created: 2021-03-02 22:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5488a0bfce88dba78eb32f0c7be889cc SHA-1: 19de4900b97da6d3e7ef3d70522b86b6805a0123 SHA-256: dec992b4f595aaa05066a4b5bdb416651cbb2a6c584a7a918f58102162870dd8
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a heuristic indicating an external URI. The embedded URL, https://jumiwimov.ru/strik?utm_term=midea+washer+dryer+combo+e21, is likely part of a phishing attempt to trick users into clicking it. Although no scripts were explicitly extracted, the PDF structure and the presence of a malicious URL suggest an attempt to deliver a malicious payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=midea+washer+dryer+combo+e21 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388174/normal_600303a633090.pdfIn PDF document text
    • http://pobesegu.scienceontheweb.net/45194534443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_600d139e0547c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426697/normal_5fcf58a2443bf.pdfIn PDF document text
    • http://finipupote.mywebcommunity.org/ragagipafujotetadamesub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457839/normal_5fec1fcb4512e.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/jesapaniveva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369328/normal_5fded19569daa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377924/normal_5fedf5a7a48b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427501/normal_603afe153ae0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5fc69fa0b0e91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liforese.epizy.com/tomoxumitusamobuwiri.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/65989807709.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/kexeru.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/vs2017_xamarin_android_sdk_location.pdfIn PDF document text
    • http://gebopotaxe.rf.gd/vegarevunetorajov.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/23228277794.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/37288172688.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_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 5672 bytes
SHA-256: 11b7ede8062097c8d319da6d92f9c6ff28505d3c4c363d32cec72f7dc3765654
font_01_sfnt_off00011c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C40 10724 bytes
SHA-256: 8579e758f6747289c53571774b1af3ef290f4d2fb3ddcda3a5b520072375c6a9

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