Malicious PDF — malware analysis report

Static analysis result for SHA-256 503cd27b05da482e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 05:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d2588973f908273e241f826ca1d420a8 SHA-1: 94c6fdfdf5748660a9ae5a66b04eac00d534da93 SHA-256: 503cd27b05da482e906df243cd71b3266ad185d9e55170e41e3e94523ba11556
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm and a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://archism.ru/uplcv?utm_term=how+to+clear+data+in+phone PDF link annotation
    • http://ingmontagna.com/userfiles/files/86106654700.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/45919579488.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903060050.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/mukamu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9f4dfabb5ccec3f79d46575aa6158198/19863627844.pdfIn PDF document text
    • https://ka-base.no/images_content/file/wituvawaga.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/99700670439.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/8601479746.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/47183914679.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/38709445216.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/29409166134.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/45123646617.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/punaxosiz.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/52490171574.pdfIn PDF document text
    • http://uhorder.com/upload/files/46025380989.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/98278104019.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/wigego.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/borosejojomibopurom.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/lagafikopokodirumum.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/59555244723.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/47347782658.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/monixadubipirilogomap.pdfIn PDF document text
    • https://motoralbini.it/files/file/nawenolusikokugaw.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/02/zegitusixilajaxovoguroniw.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/b77df6898dcfa7113bf350fb51f229f5.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/9283292009.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/40286900000.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_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 17520 bytes
SHA-256: fefdaf898ad1816d545099f9c1a0282d846109addebee1ff91de6012b105fb31
font_01_sfnt_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 10520 bytes
SHA-256: dc9b1351848c965a9dba3224fe1d61a07a33b7e012132bede2b8483e3ace8b83
font_02_sfnt_off00011fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1