Malicious PDF — malware analysis report

Static analysis result for SHA-256 f506ba084fe05d45…

MALICIOUS

PDF

77.3 KB Created: 2021-09-23 09:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d6dab05c3c8d574b4bedb5abb65d63b9 SHA-1: b752cd35988473becdf9252ecbbf1526e616e5b2 SHA-256: f506ba084fe05d45a829b56f5ef9be649251e5ba3e4273f76ebe12ec14669e13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing or malware distribution tool. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=european+ship+simulator+apk PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141eec8a3fa1---japesogara.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/27344235279.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/gopubapetako.pdfIn PDF document text
    • http://st03.it/userfiles/files/68299814950.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/70017161826.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/naxozonewakujuluxexok.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/38156067531.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/76723392511.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/35368258462.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/48851793681.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/82510986098.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/27585690280.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210916_054735.pdfIn PDF document text
    • http://kisito.com/userfiles/file/donekijojefewajutefoko.pdfIn PDF document text
    • http://bronia.org/userfiles/file/51174143433.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/begetudofozafesive.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/44563301128.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/63315274467.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3ec1cab533b8d079c9f695d1dc2fc723/30900106403.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/zubebavepugadikun.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jirapugumimifevad.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/pimisedazepe.pdfIn PDF document text
    • http://remobudostol.pl/pliki/87816766330.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/71299341476.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_off0000c900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC900 17736 bytes
SHA-256: 1bd34818ec45a545b2507431baa9504307b89b8c8c447520c1ffbeafbdd12c37
font_01_sfnt_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 10692 bytes
SHA-256: a00646c282be0f4ad58fcccc8ab9f3fb481c476777e7eaaf65037b3c469e6c49
font_02_sfnt_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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