Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b63615b33d7548…

MALICIOUS

PDF

74.9 KB Created: 2021-09-23 17:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 143142b04a81cd5ba61312d5184a432c SHA-1: 0ec147b8cbb0f57f8f20617c941f7fc41be99d5c SHA-256: a5b63615b33d754847823a73f99e0e9323bd77cef2f89d1a423def2286ede210
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one specifically identified as a potential lure for user interaction. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest this PDF is part of a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=mario%27s+face+hd+download PDF link annotation
    • https://karapinler.com/calisma2/files/uploads/48391371828.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rijivetijoderor.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/24645011769.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/4939112971.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/muzemifaf.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/18297926294.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/muful.pdfIn PDF document text
    • http://placc.info/up_image/44620190546.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/74031861812.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8ba76a688---88356767055.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/80143262565.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310bfc5011a---45067888269.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/gisevazomomevaxejapipi.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/7530006780.pdfIn PDF document text
    • http://micruts.org/userfiles/file/begotolidoxofikudavebun.pdfIn PDF document text
    • http://eichler-kammerer.de/81753952425.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/rowajejuwasefutitedozikav.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/96305796800.pdfIn PDF document text
    • http://samtle.net/ckupload/files/laxojexafom.pdfIn PDF document text
    • http://0953057778.kad.tw/kads/ckfinder/userfiles/files/xuwakujoxumovin.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/46577231886.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/51462061595.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/vafufavisolisalu.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/koneruzuto.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_off0000be35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 18196 bytes
SHA-256: 4d328650cc77194d6bb27f825035a158781d8a337a81a0c82698bae660802418
font_02_sfnt_off00010544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10544 10588 bytes
SHA-256: ae23e975e6f909fabb4cd1ef5bd511911a1a64b57018deb77ba3eb2ba3adff11