Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc2e99194e899981…

MALICIOUS

PDF

88.1 KB Created: 2021-09-21 23:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d19c14b9635124643dcee98159680d5 SHA-1: 1560d62e0a665f2174f37befc6fad9d1d9dfab11 SHA-256: cc2e99194e89998182e70911113d5fe124bf30ebcc256715aca87dce18b213ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a phishing or malware distribution campaign. The ML classifier also returned a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=software+para+crear+app+android+gratis PDF link annotation
    • https://europacreativaeuskadi.eu/files/galeria/files/nofopirozidiguz.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/sutiwaxefododolixim.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/foxesevesijomokanalelopuv.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/xuweperoje.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/46617021573.pdfIn PDF document text
    • https://patc.fr/imagesfile/13001561355.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/67359791741.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f54b35b0---5240632195.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/penaseliruxerowalejidu.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/dovibipo.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b0ed868881497fc14a36afbc7a248e37/77237869643.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/xaxufoxe.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/51787595666.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/vopelojakufadonukisew.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/88280149371.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/72468131157.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/15858458233.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109101915479000.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/94967649235.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/lumedoja.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/96173632569.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_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 17928 bytes
SHA-256: 012278edfd8ecd113c013863fa9c63bebce5c9717ea5b2e5f48c2e5340bdd927
font_01_sfnt_off000121a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A3 10908 bytes
SHA-256: 09f49ae25e769d6a80b27ffb7a47c7af2541eebcd6091e9ad4eed8576372cb3d
font_02_sfnt_off00013adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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