Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd4858373df13d7…

MALICIOUS

PDF

68.4 KB Created: 2021-03-22 18:21:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fdd5c940c24e1e2f2a3f8dd95392f8f SHA-1: 60fc3cb86993579291b9038e0848849e713a5076 SHA-256: 8bd4858373df13d7185634e08b93989d1b23c77267a44a85654745fad98fe2bb
104 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and an external URI pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to redirect the user to the malicious URL, which is disguised as a search result for exam answers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gimoguvi.ru/wix?keyword=realidades+1+capitulo+5a+examen+answers
    • https://cdn.sqhk.co/wisewuguv/7T5Gxja/within_movie_wiki_crawl_space.pdf
    • http://panedapupugaxe.22web.org/acids_and_bases_experiments.pdf
    • http://kosodidaxelo.22web.org/dimplex_blf5051_installation_manual.pdf
    • http://buviturowugigew.66ghz.com/rca_dvd_player_surround_sound_remote.pdf
    • https://cdn.sqhk.co/losomilodip/bhjIhfI/mens_haircut_fade_side_part.pdf
    • https://cdn.sqhk.co/bipuzojafa/ihjhf1o/tomep.pdf
    • https://cdn.sqhk.co/vurifozi/hifiajj/fall_guys_game_free_download_for_windows_10.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wegijadisi.rf.gd/penyakit_cacing_kremi.pdf
    • http://kopuperoki.epizy.com/donuzerogegudexirob.pdf
    • http://vanabigura.rf.gd/xebiwutokomizelifupupo.pdf
    • http://zuranigifev.epizy.com/xofajutarizesevopug.pdf
    • http://xuxusemo.epizy.com/36377292176.pdf
    • http://pemulotik.epizy.com/80672017039.pdf
    • http://rorujuzolu.epizy.com/12419660772.pdf
    • http://zufelagek.rf.gd/kuvapifarenitarasopul.pdf
    • http://muvalinifotu.rf.gd/educational_psychology_questions_and_answers.pdf
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_70de1975326143128674ef43f5122da9.pdf?index=true
    • http://pabipinipimano.epizy.com/19384257100.pdf
    • http://xarujubapemir.epizy.com/95914132470.pdf
    • http://tenowuwewid.epizy.com/vehicle_sale_agreement_format_in_tamil.pdf
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_7c3fd589915e4a9887d7cdb1153f4bf4.pdf?index=true
    • 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
stream_004_off0000dfad.bin
d1b8540a06346302c3cb85215e86b334d106090c1b2222859722c4f3ec970677		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDFAD 10620 bytes
font_00_sfnt_off0000ccb3.bin
1898d0a5224679537a7d564086bde7d56edefaf8c944bc81c328555597899076		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB3 5564 bytes

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