Malicious PDF — malware analysis report

Static analysis result for SHA-256 b752ebd725f47373…

MALICIOUS

PDF

87.3 KB Created: 2021-01-22 05:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 541a0078a609419d9004299cd106a1e5 SHA-1: 2f795e1ab26c8bc498fef5f3464f97256c94bacb SHA-256: b752ebd725f473736cc7015f6139b907e7987edd71296ff55fccbaa3cde944b7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and the 'link farm' heuristic strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/123?utm_term=the+elegance+of+the+hedgehog+pdf PDF link annotation
    • http://bepegut.iblogger.org/kimamusefevosoze.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/gjhbicE/super_cartoon_adventures_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/TXSTSO1/msnbc_live_stream_on_smart_tv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467278/normal_5fcf0bc383a9e.pdfIn PDF document text
    • http://ruwegekugite.22web.org/handwriting_practice_sheets_4th_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/9jijhiY/sixune.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/eheQidD/ms_pac_man_maze_madness_ps1_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dimarujevetuvif.epizy.com/64785101004.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/exercice_orthographe_cm1.pdfIn PDF document text
    • http://suvapik.epizy.com/iso_27001_interested_parties_template.pdfIn PDF document text
    • http://luzawuwu.epizy.com/corrugated_roof_sheet_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/yandex_disk_linux.pdfIn PDF document text
    • http://pixagikaw.epizy.com/6888240290.pdfIn PDF document text
    • http://vuwejamadadodi.epizy.com/98231727710.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/mozukevagomixufuvirizoruf.pdfIn PDF document text
    • http://pavinudoj.epizy.com/aaaah_full_movie_at_tamilrockers.pdfIn PDF document text
    • http://relumewamamit.rf.gd/core_java_quiz_questions_and_answers.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 5092 bytes
SHA-256: ee32e04972f164526b39abe4d014631844158e6848f938e63218b03365e059fd
font_01_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 11208 bytes
SHA-256: d46835d7015f1b54a98783f276cd582824770b814ad243ead2b82e233451b927
font_02_sfnt_off00014038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14038 6368 bytes
SHA-256: 59bde7c60b7891522f84a0f72e00e076182883851be5dd10ad7d339274655734

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