Malicious PDF — malware analysis report

Static analysis result for SHA-256 44439c1374ca4b32…

MALICIOUS

PDF

93.0 KB Created: 2021-04-02 00:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 809887d917fb0f3b7bdd4c64cce6f64e SHA-1: d0381d9b0957276c19a604633672375be5e9aec2 SHA-256: 44439c1374ca4b32bc2718b356f76823f1b18440a37997c25cc272498d868a03
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. Although no scripts were explicitly extracted, the presence of external URLs and the overall detection suggest the document is designed to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=10+most+common+phrasal+verbs+in+english
    • http://in-arenas.com/gegajwdar2.pdf
    • http://copyrightsupport-ig.com/rolajuhit6q.pdf
    • http://lnstagram-verifedbadge.com/how_to_clean_a_navien_hot_water_heaterwit81.pdf
    • http://intekzafast.online/gosport_war_memorial_hospital_report_2018ahkcg.pdf
    • http://hairsprof.ru/las_mejores_frases_de_la_fuerza_de_sheccid0q5d8.pdf
    • http://saniwigudovo.scienceontheweb.net/dyson_small_ball_vacuum_cleaner_reviews.pdf
    • http://nokilibetajew.mywebcommunity.org/abbyy_transformer_2._0_serial.pdf
    • http://lnstagramcentre.net/mathematics_test_answers1g0xp.pdf
    • http://bekopomulasebi.getenjoyment.net/administracion_de_recursos_humanos_snell_bohlander_14_edicion.pdf
    • http://vitodibiwanezej.mypressonline.com/437497901.pdf
    • http://xiwesesakuvel.medianewsonline.com/32563130424.pdf
    • http://bikelumonekodex.mygamesonline.org/book_reader_download.pdf
    • http://cardio-natural.info/bemijebedojavilc4x7w.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/02b5a748-3dc5-46a8-8870-9d02898f68eb/6315940607.pdf
    • https://uploads.strikinglycdn.com/files/9ce7b964-7a03-4f4c-ab47-aa3a29759763/vidas_secas_summary.pdf
    • https://uploads.strikinglycdn.com/files/bce7f687-bb0b-4805-910b-fb5248bf2e16/how_to_use_quick_results_for_nclex.pdf
    • https://uploads.strikinglycdn.com/files/04da957b-49eb-41b6-9cfc-c1d1d86564bd/16276317343.pdf
    • https://uploads.strikinglycdn.com/files/6caa18e6-3129-461e-86b4-5ef38690263b/91844886221.pdf
    • https://uploads.strikinglycdn.com/files/ab24860e-6b5e-4595-a3e4-49957198106c/mosewajisulapudikitojevul.pdf
    • https://uploads.strikinglycdn.com/files/92758b0c-392e-49f2-9b68-1835a72a27f0/lewokivigumedilibefakepu.pdf
    • https://uploads.strikinglycdn.com/files/66a9e5b0-7093-45b3-ae3c-c6d08f624248/assignment_03_en130_english_composition_ii.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109b4.bin
50dba80abc4e818651f725a7e10386c9680b4bdb0f509df769fd84eccaf685cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B4 5436 bytes
font_01_sfnt_off00011bf3.bin
f1636745050eacaaf6d6bcdf224b6f2664ff10abbaf6e99b59edd773138bdf20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 11032 bytes
font_02_sfnt_off00014130.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14130 16204 bytes
font_03_sfnt_off0001565f.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1565F 4324 bytes

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