Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a555f36748ce78c…

MALICIOUS

PDF

95.9 KB Created: 2021-03-21 05:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e44e25d214b04f64b0b910b47d19043 SHA-1: df0499d8cccd40999705b03ee8b7c29be66dbc54 SHA-256: 4a555f36748ce78c8f19b2a871d0b7e54befbb38e05d9943de4ffc65e47b45f7
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is a strong indicator of malicious intent. The ML classifier and ClamAV detection further support this assessment. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall detection by security tools suggest this document is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/wix?keyword=constitutional+law+exam+questions+and+answers+uk
    • http://zugobopepoj.sportsontheweb.net/54791040048.pdf
    • http://nafarami.medianewsonline.com/how_long_does_wick_last_in_kerosene_heater.pdf
    • http://rezolawanelu.sportsontheweb.net/razufapadibejapeno.pdf
    • http://fotulemeliluk.iblogger.org/balderdash_cards_printable.pdf
    • http://zizodoroluxonaf.sportsontheweb.net/wireless_communication_technology_blake.pdf
    • http://pavezala.iblogger.org/performance_appraisal_comments_for_drivers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zafirawit/73547069168.pdf
    • https://s3.amazonaws.com/tugabijenovili/cas_lp-1000n_label_printing_scale.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/84540530917.pdf
    • http://purupuladufuba.rf.gd/hssc_clerk_answer_key_2019_latest_news.pdf
    • https://uploads.strikinglycdn.com/files/103b5df4-4238-4322-9146-487e400dbb79/great_synonyms_in_hindi.pdf
    • http://fuvarijes.atwebpages.com/mujigadafoxutaze.pdf
    • https://uploads.strikinglycdn.com/files/f824933d-00c8-4def-8484-dd83693049ed/recoleccion_y_analisis_de_datos_en_una_investigacion.pdf
    • https://s3.amazonaws.com/dorobukasawituw/82174626882.pdf
    • https://uploads.strikinglycdn.com/files/6f686f9c-3598-4424-9e04-eec1a98919ae/craftsman_109_lathe_manual.pdf
    • https://uploads.strikinglycdn.com/files/a7229192-7943-4c6f-9ef6-cc69f55f1102/nipepezupilara.pdf
    • https://s3.amazonaws.com/tunenijexe/vivah_movie_free.pdf
    • https://s3.amazonaws.com/bitajemisajoz/lejuxupefosejipoxu.pdf
    • https://uploads.strikinglycdn.com/files/f6838129-5e10-428f-9d21-a5616d77c7a8/why_did_they_send_my_package_back_to_sender.pdf
    • https://uploads.strikinglycdn.com/files/245a6143-e5c1-49f2-bfbf-a1fddb5e48a4/how_much_horsepower_does_a_2016_mustang_5.0_have.pdf
    • https://s3.amazonaws.com/wizakokowe/237132934.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_off00013b33.bin
e07640089b626a108727bfcf919e49f7639254b51bcf67046a4120dd16da24a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B33 5224 bytes
font_01_sfnt_off00014cf1.bin
375a5e2e15cbb6d08fa28315061c2619dc7875aa9bdbd1a9187d21b8bbc06152		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF1 10924 bytes

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