Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ffe2415101bae3…

MALICIOUS

PDF

76.1 KB Created: 2021-09-08 18:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 549585e6a6aadab4dda7214f00415a56 SHA-1: dbd2b50c25d723a4c69166f3084b9070a995de71 SHA-256: 53ffe2415101bae3bfd0d68a8fbddf8d9795cc3617642789e48d2b4bbd608a01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous external URLs, indicating a likely redirection to malicious sites. The PDF's structure and embedded content suggest it is part of a phishing campaign, potentially using a lure to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=darkly+dreaming+dexter+pdf+free+download PDF link annotation
    • https://mk-sito.it/uploads/file/36352145469.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/joruvojefovigivusemipo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133716691551---sutosusivog.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/lugiwaladokisoroxumaj.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/fiviwubipobuvifej.pdfIn PDF document text
    • http://e-sheremet.com/img/41269248980.pdfIn PDF document text
    • https://auto826.com/uploads/files/jetik.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/dozomorinerofufetexi.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/50463925518.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/sufol.pdfIn PDF document text
    • http://jonme.net/ckupload/files/kuxepokodepubavozibusizaf.pdfIn PDF document text
    • https://alkoplast.rs/files/bipolabigivuliriva.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/900030194.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109080613112498.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/74524596793.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/30300882414.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/99434707836.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/82005933269.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/88508840290.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/39918205854.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16131970831746---xaluregoxoruma.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_off0000bfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFF 18876 bytes
SHA-256: 493daaac847e5c752ee7512dd3ed1e63392cd168c0b6d0e0a9f701a1c0780939
font_01_sfnt_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001094a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094A 11068 bytes
SHA-256: b31ae37faa33ffae12f3413dc5cd19b54c23b70e7ec0a8a4b12ca6adfe1bbc12

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