Malicious PDF — malware analysis report

Static analysis result for SHA-256 3211f01c7bf10b08…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 23:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0a7658442e3ac57aebbed562f45d5e6 SHA-1: ee08450b528ff140180237f250f183b822520249 SHA-256: 3211f01c7bf10b08a329a4f624da78a263271e390355a69e20c1a1288665001b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document body, though heavily obfuscated, contains embedded JavaScript, suggesting an attempt to execute malicious code. The presence of numerous disposable links and a callback lure heuristic strongly points towards a phishing campaign designed to trick users into contacting malicious actors under the guise of a support or billing issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131349eea299---70587030508.pdf In PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/33916190527.pdfIn PDF document text
    • https://pcetravel.com/files/file/garigadijide.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/59759702008.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/52533611196.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/ralip.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/20218839093.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/gogawiwagojokukomukedatuv.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/664151161.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/dubanovisafox.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/28728555815.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/57640148288.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/lisusegiguforuti.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/devugipumaxurejup.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/9dc0cbf28ba7522bcd16a18d90f8e989/53318377655.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/65866768587.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/wizuzob.pdfIn PDF document text
    • https://digireg.ru/upload/xejawisofaros.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/520015604.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090219564486.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210908034734.pdfIn PDF document text
    • https://kawanmto.org/contents/files/85219297392.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/7983969888.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/89603037194.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/jolovolugumujodevidilot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+go+joystick+androidPDF link annotation
    • 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_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 17984 bytes
SHA-256: b37fd4e7f94619a261f99b2fb7c156957065b05702b1da90ea24ab4166ea840f
font_01_sfnt_off00011294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAB 11004 bytes
SHA-256: 2a8d65a32e7962fbd31f97ec7b13f521d43937ba4b70185ab162ce6348e351a5

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