Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e10a9d0ab21be5…

MALICIOUS

PDF

76.3 KB Created: 2021-09-14 10:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4385bb04b47b363e3ba5608687f3f1c SHA-1: 55c7391483389d4e1a4a9a8f1f389bb1a487ea1c SHA-256: 49e10a9d0ab21be577744faa412298b7e686c2dfaa6c3e576219ebe4c9945504
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, with one heuristic specifically identifying a link to an algorithmically-generated URL hosted on potentially disposable infrastructure. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. ClamAV detection and ML classification strongly suggest malicious intent, likely to deliver a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • 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 http://www.petersonassoc.com/emailimages/file/70045085346.pdf In PDF document text
    • http://ontis.sk/editor_uploads/system/files/38224720846.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/venezilewezorodon.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/65939329050.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/jadujisuvuvogom.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/wexoxinababuwisefenu.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/89927412312.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/jedorekapilenul.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/tegumulujomilutudeb.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/825768097.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/16246963966.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/636249176.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134db7b53b71---fivotararonenazod.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/subetadadunefijelaf.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/zudojororulixorevibebepar.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210906023329697970glmf4.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/zolofafemapamanufo.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/17837604627.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/witibufulabodijez.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/lanoxiwu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b2c7336e0---49911876185.pdfIn PDF document text
    • http://eternaseguros.net/files/files/kukadesesarodijefasodan.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/jerutukonewojisojojumijo.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/47747006660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+gallery+replacementPDF 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_off0000c89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AF 16364 bytes
SHA-256: 92ff0a500a13c872acd9ffdee29a1b667a5c07e634269564731ba2e8e63404b6
font_02_sfnt_off00010aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 10784 bytes
SHA-256: 123264ed727de4644980e880dab4251deb1652a3637b745aa9f3285bd4347690

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