Malicious PDF — malware analysis report

Static analysis result for SHA-256 8380b1f20b056148…

MALICIOUS

PDF

72.5 KB Created: 2021-09-25 17:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f953e09882c56ced6b04dc8f990fd55 SHA-1: 71d42502a8a0ccf50fd673bcf99579bdbdb92b00 SHA-256: 8380b1f20b05614880ebb3403c1ebee90d77b7c9dffcd27b54affffaa5d3b243
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of many URLs pointing to PDF files on various domains indicates a broad effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=download+game+dev+story+apk PDF link annotation
    • https://machinex-machines.com/UserFiles/File/23217141369.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/38137107877.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/74236676737.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/80966337836.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/19767210658.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/nelovenodojebepifuri.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/346e7cbe13b59ba0d9e75d6a3badb18c/dajadepusi.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/45264471025.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/36440041297.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/jinemogobaboluva.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/64613283380.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/zejotem.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/2463792411.pdfIn PDF document text
    • http://baoveantam.info/upload/files/38680189898.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94b6e93ec---vofirikapidizas.pdfIn PDF document text
    • https://cartolmania.it/file/dakowewusufelekuv.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/xigoxawaxutufutapo.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/88516262377.pdfIn PDF document text
    • http://herve-coiffure.ci/files/52143676448.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/vixusofaso.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/notuwixizu.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/41748563520.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/78549012062.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/22372005324.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_off0000b544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB544 17724 bytes
SHA-256: 4ef9f192272adffee5490dfb4a5648e0d042f96e8a5fcd77d4c4cd77917a9504
font_01_sfnt_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 11000 bytes
SHA-256: 83b60a4be080e40b1c2774e0d5ffa4826d05f44e248c5b4d91ff5f6ee0f81fef

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