Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c8315348000256…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 23:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56a1216cd94a43ce862d59fecce7e592 SHA-1: 5ad8cdbc6999201ac0ac42d48a1d267a68524d3c SHA-256: e3c8315348000256593d918c907471da7e6110b172e848700b4c1428210eef9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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 http://elektro-galerie-hamburg.de/userfiles/file/66699488938.pdf In PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/753118534.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/93046734884.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/48a2711854fe384faefcd09937eb8dc8/79226207901.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/nafexofebamonixupulewu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614257744f52b---dugev.pdfIn PDF document text
    • http://ipceurope.be/assets/file/81484025147.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/kaviwegenawo.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/65933133903.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/65722349124.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/sidutubasosajedubefozi.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109041402563473.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/73566156964.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/xejifemilurora.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/lejegokazoloko.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/53567521938.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/bokugazinuwuvekela.pdfIn PDF document text
    • http://metapolar.hu/tmp/33664035662.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/vogejas.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/siduzafovejusapot.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/92814836177.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/kajosamawox.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/7043336090.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/17637625509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hungry+shark+world+download+mod+apkPDF link annotation
    • 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_off0000d531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD531 17720 bytes
SHA-256: ad63be077d494ef2f1602d1068fdc60192a11c857f2021df0c227a9b05000f2e
font_01_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 10900 bytes
SHA-256: 6ead70ad9bfa225263b14dd9c82f04afaf4d686a56d4df647d3f65430927f919
font_02_sfnt_off00011c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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