Malicious PDF — malware analysis report

Static analysis result for SHA-256 b143674092d5275a…

MALICIOUS

PDF

82.7 KB Created: 2021-03-09 15:34:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c757c5fdc2f13a1bab7b8ed6ba40b55c SHA-1: 4a2c0af38217229fded1dad20ab7c32a26d4eca8 SHA-256: b143674092d5275a6e981702412b7430a0058c77657278622915e2df76e663b4
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/award?keyword=examen+ser+bachiller+enero+2020+pdf
    • http://barajofa.mywebcommunity.org/midefin.pdf
    • https://cdn-cms.f-static.net/uploads/4490367/normal_600b64456acc2.pdf
    • https://cdn-cms.f-static.net/uploads/4488315/normal_600a0d8b69b27.pdf
    • https://cdn-cms.f-static.net/uploads/4450250/normal_6010cad576eba.pdf
    • http://wojisub.mypressonline.com/49786661944.pdf
    • https://static.s123-cdn-static.com/uploads/4367301/normal_6002854399f06.pdf
    • https://cdn-cms.f-static.net/uploads/4384036/normal_6045051c25ed5.pdf
    • https://static.s123-cdn-static.com/uploads/4455377/normal_600042842b56c.pdf
    • http://tixokapine.mypressonline.com/381081846.pdf
    • https://static.s123-cdn-static.com/uploads/4469355/normal_60022539f28f3.pdf
    • https://cdn-cms.f-static.net/uploads/4469630/normal_5fe95ebe4b157.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/sugowubuf/players_handbook_2nd_edition.pdf
    • https://uploads.strikinglycdn.com/files/7ceb2849-205a-4cb8-b703-0b66139f32d5/english_conversation_topics_for_high_school_students.pdf
    • https://uploads.strikinglycdn.com/files/02cd67d0-28eb-45f3-b4aa-73e983c2a875/bissell_power_steamer_heavy_duty_3-in-1_steam_mop_and_handheld_steamer_for_outdoor_use_2685a.pdf
    • https://s3.amazonaws.com/jokotaziweluge/ghost_boys_characters.pdf
    • https://uploads.strikinglycdn.com/files/6a0207ca-2e30-4f75-9f81-abf68d1f8b6e/39664961174.pdf
    • https://s3.amazonaws.com/kikunojulejuj/multiplication_table_worksheet_1-_12_blank.pdf
    • http://zatuvejamubolo.atwebpages.com/bks_iyengar_the_illustrated_light_on_yoga.pdf
    • https://s3.amazonaws.com/jidagafinuxesu/the_lord_of_the_rings_the_fellowship_of_the_ring_extended_edition_length.pdf
    • https://s3.amazonaws.com/vososasoxumete/24804992120.pdf
    • https://uploads.strikinglycdn.com/files/156fce2c-249f-4074-bec4-871af24ee7c7/texas_holdem_rules_2_pair_kicker.pdf
    • https://s3.amazonaws.com/gewuwasi/48364374418.pdf
    • https://uploads.strikinglycdn.com/files/02c6588f-723d-4a43-8195-f32ac44373fa/wuwijozaniji.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f552.bin
8a1d1fdcbbbe47b1dbb3ea49f4edbded1c5b6d159bdc4ac96d0a050cd865452a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 5540 bytes
font_01_sfnt_off000107e3.bin
35e2626cc6c5f543fda2586eb178d667a018bedc00f2932592306159c73e3149		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 12100 bytes
font_02_sfnt_off00012f18.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F18 4324 bytes

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