Malicious PDF — malware analysis report

Static analysis result for SHA-256 be453c8ff483093c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 17:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 324b1c24d46abf47d0bd52cefdd0d10c SHA-1: 94dbe03162fc335b748f444539b207d28eb4b20e SHA-256: be453c8ff483093ca32f46cb1ffa95c5cfa4c2c11be36e0d9e974da53ebbe2f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The presence of a link farm on disposable hosting, combined with a search term lure, suggests a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable, limiting further analysis of the exact payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://slbreakingnews.com/ckfinder/userfiles/files/titoborasu.pdf In PDF document text
    • http://parbatsamajjapan.com/img/files/files/73729183587.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/30363979272.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/bezeruneditazu.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/jegabovemudakonit.pdfIn PDF document text
    • https://mauspro.net/upload/files/belopedanutimoniboj.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/49370199014.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/66690218057.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/rutedonixixowasogebaxanon.pdfIn PDF document text
    • http://ed-union05.ru/files/file/dimuziwevelajotudefat.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/12719301674.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/noxedusulubaxape.pdfIn PDF document text
    • http://hkacca.com/userfiles/dajotowagajifosaladobupag.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/xugururulupalumek.pdfIn PDF document text
    • https://edusfera.pl/upload/file/sizumugititek.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/88861455621.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/8884039742.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/21624167682.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/bakifegigakonunod.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/22632226610.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16133c72b87390---35603660398.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345a724b77b---lujazagavunenedimobixi.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///donojokobenarigarexep.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/20014179996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pokemon+rom+free+downloadPDF 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_off0000d789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD789 18564 bytes
SHA-256: a4bbd62751926369a840bbebbb4acfe0999c5c153ba6c3acc47cfa1ac244225f
font_01_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 10336 bytes
SHA-256: d893cb7ab7ca6e4bbd6534b947e6cc1e24f977fdf442c828de1f67cb351bb64f
font_02_sfnt_off00011f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1