Malicious PDF — malware analysis report

Static analysis result for SHA-256 d753e3813102dbb1…

MALICIOUS

PDF

80.8 KB Created: 2021-10-09 14:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b3645f14a1b5b78bb84ff234c1b6b86 SHA-1: 98994629e610c094dffa6377e945805596d9d453 SHA-256: d753e3813102dbb15682e1f1b10ded65836ce1369c28889c5fcf278532edd650
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to domains hosting other PDF files, suggesting a link farm or content distribution network. The presence of JavaScript and the nature of the URLs indicate an attempt to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://gemtown88.com/PicOther/file/vorugos.pdf In PDF document text
    • http://palestraarkadia.it/userfiles/files/futewu.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/vanawetitebemibajedazaka.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/70340212456.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/89207185543.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/botazepapotu.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20211004151141.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/bofaviwakuda.pdfIn PDF document text
    • http://djapm.com/userfiles/file/49503667365.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/pimomusegapepumozetoz.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/36089797088.pdfIn PDF document text
    • https://partetesal.ir/data/file/veguj.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16158959b62fe7---39240801822.pdfIn PDF document text
    • http://rcpolypacks.com/uploads/26248482088.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/nejobexewudoriruxureku.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/zikarugupuwo.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/vovosowokakom.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/monokabuxulafoweta.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/25720663760.pdfIn PDF document text
    • http://materialskbh.honamlife.com/file_upload/spaw_upload/file/20211004210623.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/u3psouoprirfchq1rhom7o5fr2/bugiretigikux.pdfIn PDF document text
    • http://hidropro.hu/upload/nitijalizuso.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/zupotulufilezaro.pdfIn PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/bitopagodojezamovik.pdfIn PDF document text
    • http://linker-apps.com/files/71274981964.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/nunomugumiwasavam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+draw+shadowPDF 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_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 18244 bytes
SHA-256: 4461a50842034f4184ded5dcb334892d7bff4a45534d77d000bfb27f181ee240
font_02_sfnt_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 10048 bytes
SHA-256: bfe29f2ee875ebc847d59548fc0224a3e45e6d9fd59df2ff2964aa3dff1369af