Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f1b4c77f64d175…

MALICIOUS

PDF

79.9 KB Created: 2021-02-27 13:31:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83fc71881f9dff51023f15389abfc679 SHA-1: 2177937b1ac2b69cdc4c7c330c90816ac558812a SHA-256: 22f1b4c77f64d17513eba20c560aa9ea3bbcef743ca326d0fc8735b5f43a9755
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 URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be related to educational material, suggesting a phishing lure.

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://pelibifir.ru/123?utm_term=intermediate+algebra+for+college+students+6th+edition
    • https://cdn.sqhk.co/lozuzupadis/ghjnihZ/18415135557.pdf
    • http://zabemaladameg.medianewsonline.com/wing_chun_hand_forms.pdf
    • https://cdn-cms.f-static.net/uploads/4380543/normal_603247eb1a299.pdf
    • http://kesuvajeb.scienceontheweb.net/where_is_the_lint_trap_on_a_front_load_dryer.pdf
    • https://static.s123-cdn-static.com/uploads/4450045/normal_5fddca5548410.pdf
    • https://static.s123-cdn-static.com/uploads/4504641/normal_5fee546f36e01.pdf
    • https://static.s123-cdn-static.com/uploads/4386851/normal_5fe069a8dabd5.pdf
    • http://lukokiwo.iblogger.org/62090992954.pdf
    • http://veselutut.mywebcommunity.org/que_establece_la_ley_de_ohm.pdf
    • https://cdn.sqhk.co/tavolimogid/3wUmazy/dhanuka_buyback_offer_2020.pdf
    • http://ziwigosopijulal.mygamesonline.org/71959721734.pdf
    • https://static.s123-cdn-static.com/uploads/4482847/normal_5ff870369d7ee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sutexuvidag.myartsonline.com/beautiful_hebrew_baby_girl_names_and_meanings.pdf
    • http://vugugevijoxudi.rf.gd/bintulu_port_information.pdf
    • https://s3.amazonaws.com/tobaziw/kivibopabofuxopapet.pdf
    • http://bavodokebak.rf.gd/safety_1st_ear_thermometer_49659.pdf
    • http://minegavanifur.rf.gd/what_was_the_new_deal_great_depression.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_off0000f983.bin
3077e6b7739fe40152c1ce02eff91416735744abe61ad3a57b2cd84eef02fbb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 5668 bytes
font_01_sfnt_off00010c9b.bin
c897c95695b30490c43a25bca2b7197c15a4b724b687e4134cf128a8c9f7cc2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 10960 bytes

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