Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b53da7e1917b7c…

MALICIOUS

PDF

76.2 KB Created: 2021-03-26 10:27:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61c4c8dac31f648b93e1baf945d98420 SHA-1: 94c8d3d4b6a17222dc90cb4407fa94b8d34710a1 SHA-256: b7b53da7e1917b7c7caaed0efafeae8516894ca8457d99326be2a10802e0004c
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, suggesting it may have been dynamically generated to appear as a legitimate form.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/123?utm_term=bnp+mf+nomination+form
    • https://static.s123-cdn-static.com/uploads/4469834/normal_6007149a46f3b.pdf
    • https://cdn-cms.f-static.net/uploads/4426543/normal_6035b981e1b2e.pdf
    • https://cdn-cms.f-static.net/uploads/4445889/normal_602538b1ae29e.pdf
    • http://xofajenakimexo.iblogger.org/69865775970.pdf
    • https://cdn.sqhk.co/kamozipu/Kjdwr5n/41413422662.pdf
    • https://static.s123-cdn-static.com/uploads/4407996/normal_5ff2fba74462b.pdf
    • https://cdn.sqhk.co/wujejelot/jfheMgy/itube_hd_video_downloader_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4385424/normal_60145034b47f5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bosovuwid.epizy.com/abbasid_caliphate_book.pdf
    • https://uploads.strikinglycdn.com/files/b612fbbd-b292-4fdf-be53-bf87c456c563/rolarogolareboba.pdf
    • https://uploads.strikinglycdn.com/files/d7592e51-da9f-42e3-a35f-45a4f913cfb5/what_is_linear_behavior.pdf
    • https://uploads.strikinglycdn.com/files/5a52c69e-c20c-4866-8f9f-b3a6c7ad794f/best_ios_mind_mapping_app.pdf
    • http://gafamiziwadi.rf.gd/future_continuous_tense_worksheets_grade_5.pdf
    • https://uploads.strikinglycdn.com/files/260b5e0c-b5fb-427a-8a45-e42323848462/first_aid_2017_online_australia.pdf
    • http://bakilipos.epizy.com/how_to_thread_my_old_kenmore_sewing_machine.pdf
    • https://uploads.strikinglycdn.com/files/24bd49de-6850-4676-9e5c-ad54bad64529/difference_between_discuss_and_evaluate.pdf
    • https://uploads.strikinglycdn.com/files/00f659a7-3a72-4b71-a14e-2e1b23bdf492/xadozutitevitavi.pdf
    • http://zepotusetazokor.rf.gd/89150045212.pdf
    • https://uploads.strikinglycdn.com/files/0de227e2-bb07-4b72-ba92-63ed6b1d3a3f/gumojewejerexasetifakor.pdf
    • https://uploads.strikinglycdn.com/files/044ff81e-0aa5-4086-a17b-ffd60ee63d47/87204011148.pdf
    • https://s3.amazonaws.com/dojivewobasuval/water_cycle_process_steps.pdf
    • https://s3.amazonaws.com/nitirew/95104399233.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_off0000edaa.bin
b71883b68c7c644fcfa0ab8c35c58fdbb26ad4036aba4ff37edb7269fd3e6c6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 4884 bytes
font_01_sfnt_off0000fe33.bin
1dc165ae23c4e1f6d2a373b7229ece5b2748aadce94215beecaa6bb1d2e900d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE33 10524 bytes

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