Malicious PDF — malware analysis report

Static analysis result for SHA-256 4830f61316ee9fa7…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 22:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c8e9cd46c966aa388f00ae08b47b463a SHA-1: 7cb0f3b1df4157e9e851d7e2d6aa660c79f8f86f SHA-256: 4830f61316ee9fa760b9f2d2bed7d073193bde30504657ddbc3d6b145f148c0f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick users into calling a phone number, consistent with callback phishing or tech-support scams. While no scripts were extracted, the presence of numerous external URLs, many on disposable hosting, indicates the document is part of a larger phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=unlock+macbook+with+android PDF link annotation
    • http://medicamarsala.it/userfiles/files/balebono.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/76747607100.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/lewebalemuri.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/tegadug.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/kozidiseriluluwepu.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/zupagoluxofoxaw.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/futawas.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/1052210334.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/vatudo.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/14/timuvamuwut.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/80851368847.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/37665062821.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/xijatul.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/lukesuzejuzilapipusigul.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/45451567688.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/46358054802.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/20122385020.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/36191157180.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/gokoxariv.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/fopiberivinolono.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_off0000d1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EB 10660 bytes
SHA-256: fac8efce4b7261db5fe919e74e539adccb57c53ba8d8f0e6062adaed2e76cffe
font_01_sfnt_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001023a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 17404 bytes
SHA-256: 16d38e6ec560d8b4a89ef23bdb185a2f97f3fd7d15811ebb4cecf29bd6ddb664

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