Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61e2710c7ff2081…

MALICIOUS

PDF

76.5 KB Created: 2021-03-23 11:26:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3f08a169dc72732bda0bca853f6dbb74 SHA-1: e8213f7db81624cd31e7bf92cf8330116ff8ff65 SHA-256: f61e2710c7ff20812d78357e2f5b7fcf1f091c12b18372a249b6815d679517da
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The 'ClickFix' heuristic indicates social engineering to bypass macro restrictions by instructing the user to press Win+R or paste a command. Additionally, the document explicitly advises disabling security software, a critical indicator of malicious intent. The embedded URL suggests a potential download source for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://nipisod.ru/123?utm_term=speed+slow+on+steam PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393752/normal_6019b001afdef.pdfIn PDF document text
    • https://zubisixoligifi.weebly.com/uploads/1/3/4/4/134479514/dd2acaf03a9675.pdfIn PDF document text
    • https://bufogepuvuzi.weebly.com/uploads/1/3/1/3/131381066/guwiresek.pdfIn PDF document text
    • https://fisadurubimu.weebly.com/uploads/1/3/1/4/131409264/fegipopodedi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481061/normal_5fec1a2869a4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_60301898cb4e4.pdfIn PDF document text
    • https://lirukasuk.weebly.com/uploads/1/3/0/7/130739032/joxireluk.pdfIn PDF document text
    • https://nunavupogo.weebly.com/uploads/1/3/4/4/134471291/5306a.pdfIn PDF document text
    • https://vaxevadokipab.weebly.com/uploads/1/3/4/6/134610393/aa3edf13a2817.pdfIn PDF document text
    • https://ronunute.weebly.com/uploads/1/3/1/0/131070227/2f62665e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381748/normal_5fcfe9c86b42e.pdfIn PDF document text
    • https://kerejokav.weebly.com/uploads/1/3/1/6/131637695/wugitekolebob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nirirojigupe.epizy.com/53245163259.pdfIn PDF document text
    • http://zilaxeputeso.epizy.com/two_examples_of_specific_purpose_application_software.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/nutagisu.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/mi_planta_de_naranja_lima_resumen_personajes.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/fopudofan.pdfIn PDF document text
    • http://mabibetajekujap.rf.gd/aladdin_original_story.pdfIn PDF document text
    • http://batitesejikak.epizy.com/dopabebovepenor.pdfIn PDF document text
    • http://riramemixezu.epizy.com/environmental_archeology.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/john_deere_71_planter_pea_plates.pdfIn PDF document text
    • http://jovebagubalolif.epizy.com/74722454884.pdfIn PDF document text
    • http://tajajal.rf.gd/duvugunoxikaxoj.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_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 5204 bytes
SHA-256: 88bc3b12ee0779b4841cc2ebbdd2221d9a827e77b362138575db563bdbb7b50f
font_01_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 11080 bytes
SHA-256: 630c6f7e895d2fee87bb0c48728f3f1c6690b24ebb144d156e997964f4779fc9

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