Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb584146d532b60…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 05:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc27afdeb03417cc2d35f8c73ddebf72 SHA-1: 0462990b08392c76bde24fb3679e6cfbf2d3e163 SHA-256: 7eb584146d532b60c7390a05a8e88589d04afc0030bb66c1cac8715a1123f14e
134 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, some pointing to disposable hosting and containing UTM parameters, suggests a phishing or malware distribution campaign. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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://chcial.ru/uplcv?utm_term=hungry+shark+hack+ios+download PDF link annotation
    • https://markapin.com/calisma2/files/uploads/negojivonijugu.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/bokaworonitukemage.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/dekomulagugezes.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/3662578465.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/latagu.pdfIn PDF document text
    • http://recrute.fr/files/files/95106948326.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462ff561139---pegerimi.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/gedikasoderitafotuveporor.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/selizomapujemufasix.pdfIn PDF document text
    • http://candientuvibra.com/images/file/tepofusawuxigimuvuf.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/xusiduwibixoxidido.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/xulawesuwenamumuw.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/kabax.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/tediwilivilesabekibeb.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/mowufomoxolamunugikuzines.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/53984631091.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/jiramukesivekazisedodevez.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/40261105853.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/75168754211.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7a456d9a---momotagixatakujaziferuliv.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/23645803959.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/balimivasojevifu.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/julaneriwosixumofefalexa.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_off0000d042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 10804 bytes
SHA-256: b8c9e4866279bd832fd983870400997045a0e3f519ff24e5c59da1e627effcca
font_02_sfnt_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 18644 bytes
SHA-256: f332084a334d65c194b2db12b59a1d117c284024fa8433a83d38c0905aaeef30