Malicious PDF — malware analysis report

Static analysis result for SHA-256 a508855e70638234…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 00:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b0a377ed108edbff125126d0d615a305 SHA-1: b24a67c7d894dcad718747c6b8f293bb2e00f45c SHA-256: a508855e706382344e316cd4d22989c11541eff0e00df7ba4935d5085792de33
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which are often used to host phishing pages or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dailyiat.com/html_upload/file/26624277937.pdf In PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/56901676431.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/3006803392.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135509e1b2ef---13512642134.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/kiwopolubuleguvamixag.pdfIn PDF document text
    • http://hoachattn.com/image/files/40368329142.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/ridefisuwidejagapezed.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/patobopasikesamimi.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/13060896016.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/18206183206.pdfIn PDF document text
    • https://irantruck.ir/data/file/parikekuxavozebe.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/xadefenu.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/mofudakemoru.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/69775354437.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/zefupasoluzuraluxamexixeb.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/51128159204.pdfIn PDF document text
    • https://everestart.com/images/stories/file/zilubovogidiboxanikix.pdfIn PDF document text
    • https://ags-car.com/upload/files/kipagixafadugeli.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161363138d1de5---gerefife.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/jibogu.pdfIn PDF document text
    • http://cmtsport.com/pliki/wezolik.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210909013027729152npxgp.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/tutab.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/fimetisofa.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/55566432957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=learning+french+pdf+for+beginnersPDF 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_off0000d76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76A 10852 bytes
SHA-256: ad9dde7fef582e052c97dd01478e94707ad336fcfa65c9c95fc05e530eeb7e19
font_01_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 17984 bytes
SHA-256: a210e57f12db74ded525c5a87f889ad3ad62c2ce124ef546b073e205e5426595