Malicious PDF — malware analysis report

Static analysis result for SHA-256 1001ca4a211c2b19…

MALICIOUS

PDF

72.5 KB Created: 2021-03-16 08:15:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41b911695f20583b613ee4fee68a89ca SHA-1: 25e1a1d01ea517a9857a6c0c927823f1ee383766 SHA-256: 1001ca4a211c2b192f00950d2747f9106c4df86d850bb1e5004b74bdca89509a
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one pointing to 'vilenefex.ru', suggests the document is designed to redirect users to malicious sites or download further payloads. The document body, though heavily obfuscated, contains metadata related to PDF generation, and the heuristic firings confirm the presence of external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://vilenefex.ru/strik?utm_term=the+game+of+life+despicable+me+instructions+pdf
    • https://cdn.sqhk.co/najuvotuwoz/FHHhcgi/bitdefender_antivirus_offline_update.pdf
    • http://richmaya.site/bundesliga_tabelle_2018_19m7wfa.pdf
    • http://rolopigabetitu.scienceontheweb.net/pretest_biochemistry_5th_edition.pdf
    • http://kopalirigel.mypressonline.com/losse_bestanden_samenvoegen_tot_1_bestand.pdf
    • https://cdn.sqhk.co/mejofiwog/5ji6icT/74631734641.pdf
    • http://zokugorevat.mywebcommunity.org/history_of_entrepreneurship_development_in_nigeria.pdf
    • https://cdn.sqhk.co/gixezovof/Nfhdida/nylon_rope_grass_cutting_machine.pdf
    • https://cdn.sqhk.co/kigoxeni/6jcjchg/browser_video_downloader_firefox.pdf
    • http://xegazinijitup.mywebcommunity.org/lidesarif.pdf
    • http://nicechange.space/72023517123941gx.pdf
    • http://creditscoreusa.info/285343310104lu2q.pdf
    • https://cdn.sqhk.co/benibavagoge/gjicjeb/difference_between_plants_and_animals_kindergarten.pdf
    • https://cdn.sqhk.co/lamimegisu/YzheEMv/a_modest_proposal_answers.pdf
    • http://dosijefa.mypressonline.com/online_business_blueprint.pdf
    • https://cdn.sqhk.co/mifopanikil/Njegeid/74942619217.pdf
    • http://topvideo.design/dapigezepesataniyk71.pdf
    • http://penageli.getenjoyment.net/dibujos_de_rostros_con_emociones.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zibelasavu.atwebpages.com/robinson_crusoe_malayalam_book.pdf
    • https://s3.amazonaws.com/gifojuxaxeva/41645055264.pdf
    • https://s3.amazonaws.com/lorerexeg/sufopuwawuravafakiz.pdf
    • https://s3.amazonaws.com/novifamigot/kolanesozowaji.pdf
    • http://ziwemasux.myartsonline.com/tizoliri.pdf
    • http://panexorumilogim.myartsonline.com/nititinageg.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_off0000dcf5.bin
93b4a5c0ab3234df5fb04b4e2e50cf7c94e74c94b7a1de8163ee2c0387824129
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 5660 bytes
font_01_sfnt_off0000f006.bin
f6e0f017f3d1c40414aab22b4e00205ffb831d7d657a952689d8fc7059d2673f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 10704 bytes