Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c5254b2dbebc51…

MALICIOUS

PDF

75.7 KB Created: 2021-03-09 20:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 685f3ed4ad6abbb07ab807b1ed383546 SHA-1: 16266ed4be077af8d9efc00a934c812525779d1b SHA-256: 66c5254b2dbebc5121400c9a3ee0f8123f26875fde890c16e14e361716aaeaf4
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, pelibifir.ru, which is likely used to host a phishing page or a second-stage payload. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external URLs and the overall malicious verdict strongly suggest a phishing or malware delivery 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://pelibifir.ru/123?utm_term=oresteia+fagles+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466370/normal_5fe441cbb1e25.pdfIn PDF document text
    • http://pedron.fun/31901906615sof0l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456676/normal_6017aacb61bb0.pdfIn PDF document text
    • http://helpverifedbadges.com/36120573732qh4h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415951/normal_603a725d7f12e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470696/normal_6013a2ba49495.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369508/normal_5fc78cad66edc.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/vokeri/cherial_weather_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c15fda5a-e395-431f-adb2-b945e2ac732b/dell_precision_m4600_launch_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e590010-9c32-48c6-8377-ec35db1db1a7/how_to_reset_your_fios_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/014b812a-57fa-425c-abce-bbb876b65d80/jilekoredoketogegesoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4dd482f-3950-424d-a68c-9ad2edb4ca28/viwunomer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e29b19a-83e4-42df-a053-3b75dfa5b88c/79362082682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76f1cbf-02c8-40c2-9a02-efcc192e17bd/vogekepaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d6ea70-1885-453e-a9ce-50df85f01569/97452028776.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/emily_post_wedding_etiquette_invitations.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/vagoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63fb3e65-996f-4888-9672-7fe84ef06cf1/uniden_6.0_phone_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/information_security_policy_template_nist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc936551-8f33-4548-985c-6baa6fa52f29/best_game_maker_studio_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e491d8d0-09e4-4646-ae12-e9df78c009f4/performax_16-32_conveyor_belt_tracking.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_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 5236 bytes
SHA-256: fe6c6cbe9376f3a3b818b7e657da468f89dcabd9e602ead30a3c62e59018892e
font_01_sfnt_off0000fedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 10336 bytes
SHA-256: 9ee0768fafb3ca8a62e19827d05be10b0df9543cbf7ee2ab8433abae27afe4c6

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