Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acd248971a339cd…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 19:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1826882539aa79fb77cd2707abcc9ce4 SHA-1: 9cf2676159486afed0e5b27f5122bb4ccc20f63e SHA-256: 3acd248971a339cda3b8932b68e186927e39de218488c960b8fb0429a6d8eb85
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains embedded JavaScript and multiple external URIs, suggesting it is designed to redirect users to malicious websites or facilitate further infection. The presence of a link farm heuristic further supports a phishing or malicious redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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.
  • 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://queure.ru/uplcv?utm_term=vsco+premium+slowmo PDF link annotation
    • http://aytekinpolatel.com/image/files/2620816855.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/2684067345.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/72953521269.pdfIn PDF document text
    • http://sushi-belovo.ru/files/72915572296.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/8s87k9vdp9p69nijp9dphct5q8/37494579787.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/32657303990.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378e7018e63---91554550991.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210909181947_148584126.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/5974286126.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/nurulopomivinaxali.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/lizamovujonoduxitok.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/75452687400.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/kofan.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/nekeji.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/31029773259.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/55147961943.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/40484546418.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/buwipaxesuxulav.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/muroxudaximojuvolutisokul.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/godibigijegudosoraken.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/96444239076.pdfIn PDF document text
    • http://snft.ro/media/file/99638524235.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/87449078166.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1491383597612e9d585575e.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_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 10328 bytes
SHA-256: aa18064c392cd56777824aad84f2812b9ff5078f66caa1ad4e48d9f90892dd74
font_01_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 17228 bytes
SHA-256: bb6afa30f663046e60289ecfd28f92ea49696aabe17bb7636875a9c7b4638170
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1