Malicious PDF — malware analysis report

Static analysis result for SHA-256 4394698ea841697e…

MALICIOUS

PDF

84.9 KB Created: 2021-09-15 23:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00e6c184396191422b69b5f4cbce9583 SHA-1: cdee6bed8b86cde91a52fe18352c08d09c0ba0ea SHA-256: 4394698ea841697e73611e5e7d80bec0f0f8bb1d5f01f450a830b5874a73a041
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files on distinct domains, suggesting a link farm for SEO manipulation or content distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://ndc-group.ru/uploads/files/78976335196.pdf In PDF document text
    • http://kayapalinakliyat.com/file/60110008470.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132da991d323---72086404790.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/tetadixuma.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/jokitugijajisoxudagix.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/72112162793.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/sulubuwerigokasadasuze.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/tizidamavu.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/goxiguroniganemot.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96589599385.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/41452967789.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a151ccb476---8696354901.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/kunalasuturajojapu.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/mupul.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/84856711203.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210911060135.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/burijabaduxuxogedazina.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/vaguj.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/95148542994.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/muzixulurudevopefop.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/nutevaxuwepimobenafix.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/25814658810.pdfIn PDF document text
    • http://korytnica.net/data/files/retilujepevame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=latest+hollywood+dubbed+movies+downloadPDF 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_off0000e7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B1 17476 bytes
SHA-256: 59e533bc6f41892ba08b00350ce3f916244b4b32a00a831514b6b1351c4afa9d
font_01_sfnt_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2E 10876 bytes
SHA-256: 15a63840d1fce5034e729872c00114403380c1f3c8dee7a92867675432139db2