Malicious PDF — malware analysis report

Static analysis result for SHA-256 19627c5ef1fc3d0a…

MALICIOUS

PDF

75.8 KB Created: 2021-03-20 20:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: eb085a2eb009a08c1ac5095e149d8829 SHA-1: a376919c59b5fb7b663247e0b28645a32c971f5a SHA-256: 19627c5ef1fc3d0ad1fbc6c476e9bb3d4354e4ee4e48530ff8907b6d89352046
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, disguised as a thesis acknowledgement letter. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/award?keyword=acknowledgement+letter+sample+for+thesis+pdf In PDF document text
    • http://vakafubetax.iblogger.org/rononowonatizogixapixa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vagasobewinepu.rf.gd/58486205186.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/laser_boresight_targets.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/rovunefegorovudilidamige.pdfIn PDF document text
    • http://bopebogixa.rf.gd/oxford_english-_english-_tamil_dictionary_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a1b5a9c-46d9-4127-a0ad-d60d7b0cbd32/wufumepijup.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/wefapapemetobitalopof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a041ae2f-9e8d-411f-849e-74a9e90e39d8/production_shift_manager_jobs_near_me.pdfIn PDF document text
    • http://zasidad.epizy.com/greyskull_lp_reddit_fitness.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/free_online_printable_math_worksheets_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/fafonofezazamafimijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a5878ca-63d1-4614-95b1-ab40dd749f3a/whatever_tickles_your_pickle_phrase_meaning.pdfIn PDF document text
    • http://patabajisof.epizy.com/basic_accounting_transactions_exercises.pdfIn PDF document text
    • http://relumewamamit.rf.gd/resuxafovewevemuva.pdfIn PDF document text
    • http://rimatos.epizy.com/lista_de_verbos_irregulares_en_ingles_traducidos.pdfIn PDF document text
    • http://takerowul.epizy.com/wax_paper_baking_sheet_difference.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/bivamokifatoriraturox.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/taqdeer_south_movie_video_song_pagalworld.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c652a1-5646-49ce-be5a-a76d8cb7a71d/bitulesejomafodixu.pdfIn PDF document text
    • http://kedumuwimafam.rf.gd/temubutogupukok.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/98555977016.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 5500 bytes
SHA-256: 9fd9ff25c55b9da96752a545c8b9781bb35d4dcd62af7e2a1371e16595e96721
font_01_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 10060 bytes
SHA-256: 499c30a835ccc1bf1658a6ac23feb38a22994956add06a444cfff12186d77b7e
font_02_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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