Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f51de18432c5eed…

MALICIOUS

PDF

70.2 KB Created: 2021-10-01 02:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: df282e76b236e144c77a82375b72a24c SHA-1: ec5c10d1dcb82793676d1b5fd0299ffe239e459d SHA-256: 4f51de18432c5eed44ebe064d5afc14f546c3534fe87d30d685d01c0cc4b7655
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a deceptive purpose. One URL, 'https://coretry.ru/uplcv?utm_term=all+american+season+3+episode+3+free+online', is particularly notable as it is directly flagged by a PDF_URI heuristic. The presence of these links indicates an attempt to redirect the user to potentially harmful external content, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 4

  • 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=all+american+season+3+episode+3+free+online PDF link annotation
    • http://konakelektrik.com/userfiles/file/7656810635.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/wopujijugivofutuv.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/84996212264.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/zujudipolofokizizomugiwo.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/94193417337.pdfIn PDF document text
    • https://ibericadearmerias.com/file/vijisupiwufa.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/wavukakizafogudulowimas.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/57646524292.pdfIn PDF document text
    • https://jck.ro/userfiles/file/45242813111.pdfIn PDF document text
    • http://tcihk.com/userfiles/56431884509.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/9279261328.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/lukodafuv.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/vapefodegemogukinaf.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/24595120802.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/fadadonavilapezoriwo.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/zajarun.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/64980874815.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/duzimexodogikateguvimi.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/lefipotavelexevamel.pdfIn PDF document text
    • http://totoumi.jp/upload/file/94066734004.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/fetobopunarefegagiruwa.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140849d0a6e8---jipegafupomamawifuvumofa.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b0ebc8bd3---35285030446.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_off0000ae33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE33 16600 bytes
SHA-256: 94d54dfc297268311b0015dca68255a716f4123145aa204a8eb4dd304f230c8a
font_01_sfnt_off0000d856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 10836 bytes
SHA-256: 81fc8671b3ef374cf19cdce06e7b2e85b68feed9cf6ddecbd837d638749811d6

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