Malicious PDF — malware analysis report

Static analysis result for SHA-256 7739ea90e258dc0d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 01:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8956ce9087ad4fc98bfb9207c5fe438d SHA-1: c8ee2aeffccfc183383fae71b91023715df84e67 SHA-256: 7739ea90e258dc0d5bff5159fec3914eb52557459447c79135e127b8c8e6a113
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with a high heuristic score for being a link farm on disposable hosting. It contains numerous embedded URLs pointing to external PDF files, suggesting a phishing or malware distribution campaign. The PDF itself does not contain readable content, but the presence of external links and the nature of the heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=edit+website+apk PDF link annotation
    • http://egitara.com/upfiles/files/26001862564.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/josexuxozesebulonisi.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca972486b0---xiwodudujodagezoxedunawik.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/96774767489.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/47973226760.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/pukujubaligalipolidajax.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/57413747057.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dusudobemetafa.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/jutejupinikasalibesuwave.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137a130c2ea6---79408604614.pdfIn PDF document text
    • http://lovesenergy.com/file/givegewerosipox.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/zujufalo.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/49097232142.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/41886370809.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/rewewotek.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/17444311587.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/91362926875.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/71740920731.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/kasexagizexadojivuvasif.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/60348346017.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/81591115514.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/sekusariruzobizisafogu.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109022015599525.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/jokutemij.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/jinubulelas.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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 10316 bytes
SHA-256: 310e88367186ae25eadc72b270cc1b5956b5fa2b88f83000f36ccb1e83bbb4da
font_01_sfnt_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 18240 bytes
SHA-256: 0b663a51ee8376a50d52bda47e092fe7bbe429e7d13579e5dc189f1b12a49a94
font_02_sfnt_off00012a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1