Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d78553530d3c93…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 23:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 0d1bb744e4db9c586730279ba76a7a31 SHA-1: af8182d9bf22d5d4789ed55db8e2b4559f451ed2 SHA-256: 15d78553530d3c9399cd4415ea74dadecf588f266c9962b6ef88443408ba9893
214 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external PDFs, some of which are algorithmically generated and hosted on disposable domains. The presence of ML_NYX_PDF_MALICIOUS, CLAMAV_DETECTION, and PDF_RANDOM_URL_LINK heuristics strongly indicate malicious intent. The embedded JavaScript likely serves to exploit vulnerabilities or redirect the user to further malicious content, contributing to a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://capitaldanceacademy.com/userfiles/files/monosotakexaxamavenufazer.pdf In PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/depusigobudobotokewukudo.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/nakujowewezogezoziwuxu.pdfIn PDF document text
    • https://bloomeng.com/uploads/julusalap.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/jufonoweguz.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/20659624186.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/josadipudibura.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/77728170947.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/79962154799.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/mikudonukatamusuvijovedal.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/jojikapoburixodovu.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/93314479178.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/25386589943.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/40230406249.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/61563208270.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210908_012638.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/zulokinugiluvulalufov.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/jututisipuw.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137114b187b8---lebigafobudokoweparoziwe.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/84265324855.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/xironijoxilewukoji.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/repuwunoxebawikanam.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/finudokudo.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/fozawa.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/6bbb8ec5051b5ca0aea9e9e91a479b54/75080451366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=grand+criminal+online+game+download+apkPDF 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_off0000df4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF763 10808 bytes
SHA-256: 2624a9ed29aa803ee91a9a5e0ad2f9746a5e5b6e0210693d0af21ad348b5843f
font_02_sfnt_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 17656 bytes
SHA-256: 87aba0917678fa37aad3ea8d74c05f445e454f655282bc7fb76853843f42e2f2

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