Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2a8d714cac54b1…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 23:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4191a21fc6807d04f6f197dc60f51536 SHA-1: b550f1c923f178b9a11d503f9770ea0bd8fb7da8 SHA-256: 8a2a8d714cac54b126db5033c87d3542dddd7a6f7b836e643addade0e416f461
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying a pattern of disposable hosting for numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=apk+editor+download+app PDF link annotation
    • http://tecresconsolidamentorestauro.it/fck_data/file/36360995050.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/95897515032.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/nisimovasezazuzalulodeluf.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/72048450403.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/japifawufobuluretevibiwos.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/85172336390.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/gawelibotuvimibavomi.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/gurabixun.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/daretemilepima.pdfIn PDF document text
    • https://atiksigorta.com/files/sifunisit.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/mixojeram.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/52074898485.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/keluneluledusirubododizu.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/xuzepujukerev.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/v15uld235p94aqgnidmk6agsls/paxudogifazivofuwo.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/komexuxomulibuwagekixa.pdfIn PDF document text
    • https://profesa.net/userFilesfile/rufubadetesef.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/92054271979.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/tasosizolo.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/6669605953.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/75472292030.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/zisoj.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/95658802793.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/59660844147.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/fivas.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB24 15660 bytes
SHA-256: eefb75bd1c11caf6d619d9f8ce6ca5b3e5854df637056cd96a8e8e244f245632
font_02_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 10376 bytes
SHA-256: 04f480cc3ce4c6bc24554daa8dae79279a7a2723030daf4ee75027029e6fe10a