Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c36d41414a33e28…

MALICIOUS

PDF

71.6 KB Created: 2021-09-18 09:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f64d972b2617b93292091c9a8ecccbdc SHA-1: d407531e30b1cd5d0dd423ee81c09ffe11c1053a SHA-256: 3c36d41414a33e2823f98267ed8e21ca4f7f696f0e5b89c2c7f18a196516b55e
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to exploit vulnerabilities or deliver a second-stage payload. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is likely a phishing or tech-support scam, aiming to trick the user into calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://crysiq.ru/uplcv?utm_term=king+of+fighter+97+download+apk PDF link annotation
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/29443204284.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/zikidawarasewasekumoxiri.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210913221524_pwcbtu.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/68796588997.pdfIn PDF document text
    • http://youil.org/userData/board/file/51024330040.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/sizuxovawerizixexezole.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/vefefenuxalo.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rupixatetikupa.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/kapusabozifixos.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/69663582004.pdfIn PDF document text
    • http://plise.org/userfiles/file/lofamunumemapi.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/62909998516.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/15798369822.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc2e15d2c---33908193138.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/sutogusizugivexofepege.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/sufifigew.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210902001334.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/pusotisesajej.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/baputufuvotukon.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/xixiga.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/41959047810.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/59409349751.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/buwubasiruwenuwopevabebof.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_off0000b684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB684 10996 bytes
SHA-256: ecbef767b5272c048477425514a07cf236ed178b6ccf41fc3239dd6602c56ad4
font_01_sfnt_off0000cfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 16076 bytes
SHA-256: eaf21eaf3b997dcf447ab11170bcdc6682c9325a32487e3da7e75fa921dca06b