Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe06ccc51a886f3…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 03:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d4f4c27fd9a47e77ce5c36111a9f4563 SHA-1: afce1324b607d93b503b2c3f9bb097d659a8f654 SHA-256: 4fe06ccc51a886f3469a7bc552c0eb88d973e83a5adbf965ad0cbbbbdf4ab4d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or scam lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and the overall structure suggest the PDF's primary function is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ketchas.ru/uplcv?utm_term=how+to+see+how+many+people+viewed+your+instagram+post PDF link annotation
    • http://osingenieria.com/images/admin/file/vixaxuzanidov.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/55852033123.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///bixidekulujirezatis.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/mewomixuwe.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/folowojakexolon.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021916017586213.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/soxavoseke.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/dujefevogunigigomur.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/30645025449.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/bosepufavifem.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/34899171576.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/97211436444.pdfIn PDF document text
    • http://tchid.net/userfiles/file/45879758510.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161370eb49cdec---77026341689.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/40567062338.pdfIn PDF document text
    • http://poiskvod.ru/images/file/23884285441.pdfIn PDF document text
    • http://sparkpro.lv/content/file/4354888986.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/78128375212.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/91209296952.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/38292532041.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/54288450839.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/56235049517.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/25077938641.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37644766463.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/06/69021600410.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/24959577715.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/32327056351.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_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 17492 bytes
SHA-256: 84bcdbdc7cfc654fb4abe794d9d7a3e461128b49b37ca7a04d0de19670facda7
font_01_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 11196 bytes
SHA-256: 9f17a0a98af67e47192cbc0195d23ebb7fd2239d4d1377cdaa7a5e7447a9c0b4
font_02_sfnt_off00011c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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