Malicious PDF — malware analysis report

Static analysis result for SHA-256 de40f564ab687242…

MALICIOUS

PDF

71.5 KB Created: 2021-03-01 05:00:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be77f84f60d8c5f29e9ada585d10c9c8 SHA-1: b0ddf9afb8894224b85a5e69c1d60b72c93183e0 SHA-256: de40f564ab68724230f1cfb4bab7e69d502a6defc18aeab6cba02bf082cf55c2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, and contains a large number of external links. The primary heuristic indicates a PDF link farm, suggesting the document's purpose is to redirect users to numerous external websites, likely for malicious purposes such as phishing or malware distribution. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=coconut+filter+water+bottle
    • https://guxisawupejova.weebly.com/uploads/1/3/0/8/130814058/c58c20477e.pdf
    • https://cdn.sqhk.co/pamezuravuno/cjiNrgh/what_channel_does_dodgers_play_today.pdf
    • https://cdn.sqhk.co/livisade/qghhbhf/mukotetu.pdf
    • https://static.s123-cdn-static.com/uploads/4379045/normal_5fca87a87723b.pdf
    • https://cdn.sqhk.co/dogutadova/jfGpib5/11493939295.pdf
    • https://cdn.sqhk.co/tajiwikiter/ehajaLm/musica_italiana_2020_nuove.pdf
    • https://cdn-cms.f-static.net/uploads/4470977/normal_60119fad90229.pdf
    • https://cdn.sqhk.co/rasepotobami/ad3tkeH/stickman_fight_battle_mod_apk_1._0._200.pdf
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/70997.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/toguvaju/how_to_connect_wireless-n_ap_repeater_router.pdf
    • http://dubejatusir.epizy.com/ieee_transactions_on_industrial_informatics_latex_template.pdf
    • https://s3.amazonaws.com/fusidejebi/40608197979.pdf
    • https://s3.amazonaws.com/zafijukopa/team_building_games_that_require_no_equipment.pdf
    • https://s3.amazonaws.com/mekonulegipero/integration_of_exponential_and_logarithmic_functions_worksheet.pdf
    • 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
font_00_sfnt_off0000ddc8.bin
14b628885f00c5b4fc07eb6a3cc86056756884577fc96ef263ff640faa4a3f06
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 4836 bytes
font_01_sfnt_off0000ee5c.bin
41bcd1af8a84401b3f337138a6027b11743759b369bcfd2102dcd24f51892670
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 10296 bytes