Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb2a15848ac2923…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 10:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7ca033048e09576589ab34bafd05af2 SHA-1: ff0250093d54c8a2a1d93de284f83e05ac7b0d67 SHA-256: 6cb2a15848ac2923dbc8083f8556617276ee6b06ac28404e71d393279e63af11
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, indicating an attempt to redirect the user to malicious content or initiate downloads. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a dropper or phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=poco+x2+super+wallpaper PDF link annotation
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/vorusafefereke.pdfIn PDF document text
    • http://devveb.net/userfiles/file/43166955353.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090723021850.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/71142571951.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/22894124704.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/42974720412.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/11097413295.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/37145685524.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/24522440707.pdfIn PDF document text
    • http://stefani.cz/fck/file/linogufujigelumovubolixo.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/sawavogufit.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/juwuguwidune.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/91326873606.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/38463256138.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e70e3640---lujesujobimusetawav.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/91535374762.pdfIn PDF document text
    • http://esejsc.com/upload/files/35658846587.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/23398418386.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/ponewona.pdfIn PDF document text
    • http://teknis.it/userfiles/files/56227087648.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/83101003403.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/tinikupovo.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/64154795475.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/lizivosavanud.pdfIn PDF document text
    • 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_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 18000 bytes
SHA-256: 04e7f4768275d3ebbd4350783f6df932f2042c6a12b15c9b79d24f950ee94007
font_01_sfnt_off00010b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 10480 bytes
SHA-256: be177a6d8d640301d0b7c2198be78e8a2913782b9e77b812c1ed62e6c9f35db3
font_02_sfnt_off000123cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1