Malicious PDF — malware analysis report

Static analysis result for SHA-256 84169d833fe0e749…

MALICIOUS

PDF

74.2 KB Created: 2021-03-25 00:27:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9de92a3d1ce81a91af76035772e46761 SHA-1: 5053b288372717a30b6c0a9584ac35fa1dddb83d SHA-256: 84169d833fe0e749d4b82e462e581d35fd69dd2aa79a58ad31148e358b4bb28f
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL. The ML classifier and ClamAV both flagged this file as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URL, https://jumiwimov.ru/wix?keyword=once+upon+a+chef+banana+bread+chai, appears to be a phishing lure, disguised as a search result for a recipe. No scripts were extracted from this sample, but the PDF structure and embedded URI are strong indicators of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/wix?keyword=once+upon+a+chef+banana+bread+chai PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388178/normal_602595daa0f05.pdfIn PDF document text
    • http://premium-cinema.com/persepolis_graphic_novel_read_onlinezxu4j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_6018771c2f4e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403263/normal_600265cf47713.pdfIn PDF document text
    • http://usesucre.pro/how_to_use_convection_mode_in_ifb_microwaveloyvh.pdfIn PDF document text
    • http://fakts.design/nordictrack_rowing_reviewscvcpo.pdfIn PDF document text
    • http://sewalenugebob.iblogger.org/baidu_browser_free_filehorse.pdfIn PDF document text
    • http://lirelejavebot.iblogger.org/75383150348.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sedowedi/universal_adb_android_usb_driver_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf8a96f-5344-4a2d-9caa-f97b67c853be/8205507596.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/femuruvunojorubujijikuzep.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/goranu.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/simatuk.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/55422224589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb4ef467-2ab1-49d9-b445-eb239261eaa7/fexexezumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43221e7c-486b-4401-aa5f-f72189ae9c50/what_are_the_examples_of_organisms_in_the_biosphere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7daa4d7c-6a7d-4acc-a14a-f7cfc3eac895/sims_3_sunset_valley_best_house.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74214c2f-f1f6-4d6a-b759-9ec35d922ecc/pubuwevut.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/un_mundo_feliz_aldous_huxley_resumen_por_capitulos.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/jolly_phonics_lessons_app.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/4252563801.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/tibotebusosagotutu.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_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 5200 bytes
SHA-256: 927651d4afb7b87a75d7267f3aae1daedd6972ae8185f517aa2adda3582391ad
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 10752 bytes
SHA-256: b29c97329b83f50901c4bc89ff6c50680de46f9ac9e273ac3f9ef8ae6009dfd9

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