Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5989dbbc8714352…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 14:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 718575cce568e178f9d3100f5b254d85 SHA-1: 975284d83f1283cd4c557a27f3302c13de378991 SHA-256: d5989dbbc87143525097d9be1cbbb082e5c8baddf5d6c9ead355f61c33fc10d1
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating a potential exploit or redirection to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of a download button lure further supports a social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/nunominafo.pdf In PDF document text
    • https://khambenhxahoi115.com/images/files/bovupawawipiki.pdfIn PDF document text
    • http://mebco.ru/images/file/mefokufubamiganimikasidaf.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/67766583906.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/mizixosu.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/zopukujirulawiporokuwevod.pdfIn PDF document text
    • http://soles2walk.cz/data/file/54942541989.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/tonulu.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/tediromadutinowifu.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1840171546613ba14838dea.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/pubokigalujaliwi.pdfIn PDF document text
    • http://www.puhito.hu/uploads/fovubuwiw.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/78079539667.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16132669cdbb22---dewivajevofaruvozefir.pdfIn PDF document text
    • https://biomisszio.hu/tmp/30274357019.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210912081750.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/navixexanomarepu.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/12144430959.pdfPDF link annotation
    • http://ipublicity.cz/data/file/xeregobomapasasinin.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613ede25dba3f---86323062024.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/92110095027.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/robatuvigume.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/46659912745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dream+league+soccer+16+unlimited+coinsPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/13435888039.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_off0000c919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC919 11032 bytes
SHA-256: 79a229043c34131350835f5c3935f9da3b276a1e3c9c1373588814bd8a4be4c1
font_01_sfnt_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 17752 bytes
SHA-256: 92a7505662952dc9f0a881f3cdbb15e118db3c4848bff4d3f325020114f0cfbc
font_02_sfnt_off0001110b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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