Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e979a381f94298…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 10:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f52646e7c1e0c0d790d43704f86cbf8 SHA-1: a0b2f89d2e864e21de6aec8a7940528da9d63818 SHA-256: 15e979a381f94298884eb0bc6e7d183655180eb14cc4233f904fa39dddcf92e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to external domains, indicating a likely phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a large number of links on disposable hosting, further supporting this assessment. No scripts were extracted, but the presence of external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=periodic+table+with+full+details+pdf PDF link annotation
    • http://evrokomplekt.ru/userfiles/file/14328629526.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/lotomamoruwoman.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/56225625793.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/72572674118.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/kamaluxi.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/8141637333.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161406be3d8c4e---19490183674.pdfIn PDF document text
    • http://annabarons.com/files/files/tapaw.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/48819226781.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/kevaxewupe.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210902125223949451.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/733afhr7aibc01tp6vl312g2av/ruxobuginovibusu.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/84945447202.pdfIn PDF document text
    • http://yejida.com/userfiles/file/41314506386.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/rudevexewafak.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/fifipebub.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/22077488578.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/jeduzorodozabopej.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/lusaden.pdfIn PDF document text
    • http://lachina.cn/upload/file/xujuporogepegusubu.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/67890188074.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_off0000cf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 10940 bytes
SHA-256: 5438a5b699149486d6ca36d45b0a38b0b220c087a004cde390a96812c87093f6
font_01_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 17544 bytes
SHA-256: e232de2c0211713d61daa8fd2b3b524b3f6b93e4ffc23bc0fa1796f8f8108f79

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