Malicious PDF — malware analysis report

Static analysis result for SHA-256 a467c70ecbc7076e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 12:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9793bf870b1d93e498225ce542efe91f SHA-1: 713fe3e915f012ae8ec756e1334e07bc390927a7 SHA-256: a467c70ecbc7076e9d9f6b0eedffcf9f88aa526db2ed9f60ea6a33e848e7f7ff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URIs, many pointing to potentially disposable domains, suggests this PDF is designed to lure users to external sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9145479ce---fuzasenifogewi.pdf In PDF document text
    • https://luatkhangthai.vn/upload/fck/file/88427580981.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/dekigi.pdfIn PDF document text
    • http://foodchemsino.com/d/files/dupokonariduvo.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/vomaz.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/femuserew.pdfIn PDF document text
    • https://tekartltd.com/upload/files/34312882523.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/wikavez.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/latilenadopesipe.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/xijumazijiwuki.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631031309.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/02/file/20210902_181119_104.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/27413020063.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/40886129617.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/wovokidunozejosumesipe.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/bedapetejoloxigobodunefi.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210907220001_wyecox.pdfIn PDF document text
    • http://attlas.center/userfiles/file/20936392147.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/marodojigozema.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/merosifo.pdfIn PDF document text
    • https://airxps.com/userfiles/files/83260263642.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210902202214_pre4ae.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/bokovamovox.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/pujasivilatusagikamobofes.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/zawuxovalus.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/tvd2rc41rg0vfgt2g929b6qbg7/melubelovedemilalemases.pdfIn PDF document text
    • http://videocycling.info/files/file/lavizodovaxujejox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+garden+design+app+for+androidPDF 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_off0000e27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 17560 bytes
SHA-256: f62c16d292da16c5909e4db30557934010a870f7f99b9dec3189f0aef31c7def
font_01_sfnt_off00010fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA6 10680 bytes
SHA-256: 4649e91a49a0a579a54542ff2559c2b7b9ade777812b322e6934034651a73533
font_02_sfnt_off00012814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1