Malicious PDF — malware analysis report

Static analysis result for SHA-256 d337f48118490170…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 00:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8252b0e5092263fe338fac39c730c6cc SHA-1: 4648a199bea31edbab5e516a5a9cbd30b41f2a11 SHA-256: d337f481184901701ac3222f856e73910ac5c3eddb4c5484ca1fedaf706ad016
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URLs, indicating an attempt to redirect the user to malicious content or download a payload. Heuristics for invoice lures and download buttons suggest a phishing or scam pretext. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 9

  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=tubemate+faster+download PDF link annotation
    • http://zeci.nl/im/image/sujajewuwozifulikele.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/zifowajeni.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/98471319347.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/garixadubase.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/64045599100.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/kalifuvifegaz.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/1003088952.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/39228305506.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/sidukub.pdfIn PDF document text
    • https://norservis.com/files/files/47622705982.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/xemufatapixogusubepaxeg.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/fulunebolix.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/96852640165.pdfIn PDF document text
    • http://mosjob.ru/images/file/majegujag.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/94134697868.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/23537058405.pdfIn PDF document text
    • https://foulardfotografando.it/file/savomebifiguwi.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/togukuximixatipu.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130e07deab24---komemasijataf.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/57060163243.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/20428979235.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/17331491825.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/futivinoromevujovagomun.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161405c86cfc1a---53257485590.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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 18024 bytes
SHA-256: 0e85baac5d885badfdd84770c2e583423f0b60217b9d20912e21987ac0ca3eb9
font_02_sfnt_off0001266c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266C 10712 bytes
SHA-256: adfc0aa4d13b58e944497e32e62674bca16104f3375af838455feb4c8b2d0bbe

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