Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbbcaa68efad8390…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 10:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4cfe4191d82a9c35fbad1bc2b266aa96 SHA-1: 2c183546a1206d292fad03ce3890d83c586f9587 SHA-256: cbbcaa68efad83909dea4c85b77de8e5846820e01c2b1b92c146948574cd5afc
134 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and a high ML classifier score, indicating malicious intent. It contains numerous external links, many of which appear to be part of a link farm, suggesting a phishing or malware distribution campaign. Embedded JavaScript was also detected, which could be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=convert+mp3+to+avi+online+free PDF link annotation
    • https://dukeofmarshall.com/ckfinder/userfiles/files/fazofilo.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/28733369696.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/1456719374.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/roxonujojuvadowalu.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/jukiluzexedetebudanogej.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/lunaluvuzulenovawot.pdfIn PDF document text
    • https://estoniapools.com/contents/files/fololaz.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131556236709---17790324391.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/nalive.pdfIn PDF document text
    • https://maviet.vn/upload/files/kebonufamur.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/71418217707.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/zetibanelowaw.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/nefig.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/35154190379.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/80188570694.pdfIn PDF document text
    • http://eichler-kammerer.de/8843082072.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/semarukod.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/zilukabozekawasuguguv.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/70843035685.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/gufetipobi.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/46734116886.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/ramumafen.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_off0000d6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 17640 bytes
SHA-256: e6084d6e74fb5b0ccea75f8b503545e84a7a0ba14b1ed40b1d18a9088ad6c6a1
font_02_sfnt_off00011c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C05 10620 bytes
SHA-256: bff1e34391c0256f7142c21d9f5e48c96e28bd5ef9a260934d361fef8d63870a

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