Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec59c1691996a2d…

MALICIOUS

PDF

75.9 KB Created: 2021-03-16 03:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17830a43ff0b02777448255de32ce00c SHA-1: 68fc420d92a70ba6fbf4f1ab12fa6c05e3dacef7 SHA-256: 7ec59c1691996a2db68bff89512a48fc57929d57eafa78f17fb0e2750ff74cd8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, with one pointing to a potential APK file, indicating a possible distribution vector. The presence of embedded URLs and the document's structure suggest it's designed to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/award?keyword=civic+education+pdf+textbook
    • http://gufutaca5.xyz/1590502634344jy7.pdf
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/1822552.pdf
    • http://dogalijun.scienceontheweb.net/34486917658.pdf
    • https://gamidamivagug.weebly.com/uploads/1/3/5/3/135324690/fororufine_tewujigolowevib_matexopo.pdf
    • http://italysummer.fun/derecho_procesal_civil_romano_legis_actionesf4sb8.pdf
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/nipul_kinifiku_vezexo_majoregorofe.pdf
    • http://kitixukizogutik.mygamesonline.org/lugovev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muvojugejoxip/biorhythm_calculator_apk.pdf
    • https://uploads.strikinglycdn.com/files/9a5fd022-4638-4a43-8125-cafd7d179c1b/is_boruto_a_guy_or_girl.pdf
    • https://s3.amazonaws.com/jixerubowi/lesson_3._4_synonyms_and_antonyms_answers.pdf
    • http://belibivizonojo.myartsonline.com/us_steel_imports_2019.pdf
    • https://s3.amazonaws.com/xetasif/3173076896.pdf
    • http://nunavaxukozu.onlinewebshop.net/blackbird_guitar_chords.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/jevakisebubomolewefir.pdf
    • https://uploads.strikinglycdn.com/files/cceddfed-171e-415a-8b4e-574712c9519c/51677488885.pdf
    • http://besafetusupug.atwebpages.com/how_much_does_maintenance_manager_make.pdf
    • https://uploads.strikinglycdn.com/files/a3cd2245-99f9-4979-9668-2f42bddcb0a8/chicco_keyfit_30_infant_car_seat_nottingham.pdf
    • https://s3.amazonaws.com/davubewu/21372624498.pdf
    • https://uploads.strikinglycdn.com/files/fba7e056-1128-4b13-8936-c8b268101d0c/wahl_dog_clipper_blade_sharpening.pdf
    • https://uploads.strikinglycdn.com/files/45f206e3-4c08-4d76-917a-920021365ffd/tappan_oven_pilot_light.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_off0000ea22.bin
09f79efd3afb5f0ac783f10e6aee21e6968c4821680980cf41b81c7c262cf776		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 5080 bytes
font_01_sfnt_off0000fb8c.bin
75bcd2e34d06e0724f65a2e587ef692d53439b04a4f46c95a63e3b48badffdfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 11204 bytes

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