Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4d480616b3ed1c…

MALICIOUS

PDF

67.7 KB Created: 2021-03-15 23:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9c66a62f4c26e0ad5968ba9bc4c41563 SHA-1: a85b25446964131156a87f11504e97749da1c244 SHA-256: dc4d480616b3ed1c48d880496427b78f31d319f6e71f3a33ccfbca75063c1352
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 intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to 'Abeka consumer math answer key'. No scripts were extracted, but the presence of an external URI and the ML/AV detections strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=abeka+consumer+math+answer+key PDF link annotation
    • https://cdn.sqhk.co/satidaruxami/gimSd5g/75215885200.pdfIn PDF document text
    • https://cdn.sqhk.co/puzokopu/7crJ1m4/zatemoliwulilosixavamikow.pdfIn PDF document text
    • https://cdn.sqhk.co/jojevirelo/hiQhhjc/best_hashtags_for_film_photography_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/LOVgdQ5/nawuluforobinuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481423/normal_60265592da493.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/geiahjd/14825672784.pdfIn PDF document text
    • https://cdn.sqhk.co/gorusuvu/cbjcuid/best_hd_movies_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/idp7hjO/kigafepuzakamomijokip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460055/normal_6011db324bd49.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/biihbhh/gothic_murder_adventure_that_changes_destiny_switch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_601240f5e47c6.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/7jjdhai/irctc_rail_connect_login_problem.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/sezebepit/60320968426.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/salmo_91_de_la_biblia_catolica_dios_habla_hoy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c2f240-7afa-4b62-9189-7a05aa2eb7bf/2008_jeep_grand_cherokee_headlight_bulb_number.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/amana_stove_oven_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/setuzoraper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f38201-159e-496f-8eac-34403ed2e799/does_samsung_nu8000_support_dolby_atmos.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/lott_brothers_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/bhojpuri_gane_video_movie.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_off0000cc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7A 5396 bytes
SHA-256: 0f30100b98bc648cb8cd553aa7bf79d60ef537a1d9641a8031a4bc8a55829653
font_01_sfnt_off0000debd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 10184 bytes
SHA-256: 6b0f364dfe9a0617e9496d213c00f84cc45332275a9bd230fe89e026e349ff02

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