Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb43551705dfd756…

MALICIOUS

PDF

93.8 KB Created: 2021-02-23 05:12:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: d80f5d23325806fe08eab585c61e09e5 SHA-1: 767361c31aac80a9b8628502e0eadf250ada7664 SHA-256: cb43551705dfd75663fc13135ab4e91cfc63a38f9c810d2a8a7587c8a87752c5
126 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 document contains numerous embedded URLs, many of which point to disposable hosting and are presented as downloads for popular software or content, suggesting a phishing or malware distribution lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating the document is part of a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=a+concise+guide+to+macroeconomics+david+moss+pdf+download PDF link annotation
    • https://cdn.sqhk.co/menodotitit/gdGjiif/goat_simulator_free_ios_download_no_jailbreak.pdfIn PDF document text
    • http://navewezaninub.iblogger.org/60013808954.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/jegekafomigap_mepoloti_zavubog.pdfIn PDF document text
    • http://kudorifet.22web.org/bumisabazip.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/fhik3jc/26161632266.pdfIn PDF document text
    • https://cdn.sqhk.co/xipugonor/DLhcZhi/crossfire_car_audio_c5-_1600d.pdfIn PDF document text
    • http://unreguezff.rest/how_to_learn_ethical_hacking_in_tamilmmi80.pdfIn PDF document text
    • http://gimakelodikovij.iblogger.org/94283137313.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/P2MBMhg/basketball_court_dimensions_half_court.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://sapakebozo.rf.gd/aluminum_sheet_metal_finishes.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/chrome_for_windows_7_32_bits.pdfIn PDF document text
    • http://sesugemedolaf.rf.gd/staples_8_large-_tab_dividers_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/faxupub.pdfIn PDF document text
    • http://gizugutopaf.epizy.com/battle_realms_1_full_version_free.pdfIn PDF document text
    • http://loratozojakin.epizy.com/wawelomuwewugezujadam.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/rezefirijuwubojo.pdfIn PDF document text
    • http://nawatelobuj.rf.gd/70016337614.pdfIn PDF document text
    • http://sopexas.epizy.com/anatomy_and_physiology_textbook_12th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/background_templates_for_powerpoint_presentation.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_off000123cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CB 5496 bytes
SHA-256: 24cbe596d130712d86f3848e275ac4755b6376b7edf9bd90ec7c235559cee0d6
font_01_sfnt_off0001366c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366C 10720 bytes
SHA-256: 6273f33fd99a47a7cb954889bbd9f4f45b9616c781840a330c21bfba6be076d5
font_02_sfnt_off00015b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B2D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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