Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59dbdee3cdddcb5…

MALICIOUS

PDF

75.9 KB Created: 2021-09-13 06:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6bdc56f23aec7829a860ae3a259b53d SHA-1: 8dc9ee0f280eec55b1f675871492a1c7f8a43760 SHA-256: e59dbdee3cdddcb56b53c2f2f9ec0ed60bd6c87ccdd3e7bf1ec84a0299067e1b
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a number. The presence of embedded JavaScript suggests it may be used to exploit vulnerabilities or further facilitate the scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huichem.com/ckfinder/userfiles/files/69452383832.pdf In PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/70546996874.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/dijegosapadibobepulasiw.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630808835.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/migogibamanobajekezobufaj.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/xavoxegugutixagizopidut.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/43972875729.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/denoxok.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/potubosemitolivibinokilu.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210913111956.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/1560668050.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/59142342277.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ba498b102---tilizesisigujawasinubu.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/tagefowinigafo.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/27393410065.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/lupikibokel.pdfIn PDF document text
    • http://gespk.com/userfiles/file/patuvawomuzepugo.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/63847547980.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/09/57821573209.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/xenipulixenapewuwijo.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/kamevuderowinatevisuwup.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/gufepivitekesixaxozone.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/54150829881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=shared+mailbox+outlook+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_off0000c409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC409 10856 bytes
SHA-256: 5238ff4f3a57eb4116a78bd480515fc6380bebc791c54176b7edd925a5403949
font_01_sfnt_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 17380 bytes
SHA-256: 81cabdbe26bab4b6b03d3da9d7ddfa8d1804385550ca3fe4baf564d2347a8476
font_02_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1