Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3ec48a7c575521…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 21:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8b5373ba34cf2f9c97322935e15d44d1 SHA-1: ed207c5f508e8c83d62fd7c7b44ecb567e93f58b SHA-256: cb3ec48a7c575521a01b952fc1b373d06109ee79dc569cb4826ba7316eab2ec1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a lure for downloading 'Among Us' for PC, suggesting a phishing or malware distribution attempt. The presence of multiple disposable hosting links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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=download+among+us+pc+for+free PDF link annotation
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/ginunewametasotidig.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/43562837394.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ad3f5da4a8b06693b1029f580310e8f0/ruruxanuwojug.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/38455789398.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210903124813582.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/26555786844.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/givom.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/latar.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/5343733987.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-17/20210917171632976886.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/goloropepoxunirosebiwo.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/54550813445.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/92016048306.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/1rcoh3dhdavk4e0n9adn88fg5b/bumemun.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/wenizuzarapu.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mikega.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/87413804456.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/fesonolurapokupe.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/27505928308.pdfIn PDF document text
    • https://isosklo.cz/uploads/palojopemiwebuvegezek.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091700365738.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_off0000c96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96F 18404 bytes
SHA-256: 10b83da88371de62cb45b64d7e7283c0aeb24ff20f520feafd25120bf11cf675
font_01_sfnt_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 10960 bytes
SHA-256: 31ed277b9e059edf2d975001c8b858f4679dc697d5d73db9c4da73b572e757a9

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