Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebf27c4fe9972a3…

MALICIOUS

PDF

83.1 KB Created: 2021-03-23 02:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4166559c3770d5ea9f7f8c0ed39a72d5 SHA-1: dadd496ab46aa81ea8f84b0f2e38a4a41aec0137 SHA-256: 4ebf27c4fe9972a3bb1b7d4304401f00c5f33f762ce3a9706973f93ba65ec9df
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is a phishing lure, specifically designed to appear as a free download. It redirects the user to a malicious URL, 'https://dugedepap.ru/wix?keyword=a%252B+901+study+guide+pdf', which is likely intended to host a phishing page or download further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dugedepap.ru/wix?keyword=a%252B+901+study+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/lixabanitav/hfDdc83/xopus.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/ZhhYifQ/236179519.pdfIn PDF document text
    • https://cdn.sqhk.co/taxotuzu/ZI8Pjby/snake_iii_java_game_320x240.pdfIn PDF document text
    • http://igafnd.org/bram_stokers_dracula_movie_plot8c9w9.pdfIn PDF document text
    • http://introdom.ru/zinikutaxidipzcjk.pdfIn PDF document text
    • http://rulabepotinujeb.mypressonline.com/43828503331.pdfIn PDF document text
    • http://kijumubafenu.mypressonline.com/36867846991.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/CUshiji/vegubefelo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/feseni/game_of_thrones_board_game_strategy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/59081856129.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/dogigapiwodutixuja.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/transformar_de_binario_a_decimal_en_matlab.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/bombay_full_movie_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/12964584194.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/zigatozifujimev.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/bhagwa_rang_song_dj_jagat_raj.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/sabigotumitatoduma.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/kohler_dtv_valve.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/4857383510.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/the_gunners_dream_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/93057665687.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/fusilux.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001067e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 5312 bytes
SHA-256: bfd0ef73803292843cba05e861b5a8a89bf07770c1ef11078d23643724dd3d1d
font_01_sfnt_off000118bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 10928 bytes
SHA-256: e2020fed48baa7ed6cbd338b5b979afd07c534227e7800825905be0c9ae573dc

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