Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35239e1177b8fd1…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 11:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f72cc361c973b3f10fdf5aa880692e18 SHA-1: a51d95f74ff635073527e6d4adcf9122690217e0 SHA-256: d35239e1177b8fd121b4a0dff25280f3bb262ea26fd9c866001c340b215f87ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=monster+hunter+stories+apk+full PDF link annotation
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/xixixerudotusosugexuzowo.pdfIn PDF document text
    • https://btegypt.com/file/35817725619.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/wubutotumafedomefopeni.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/pegita.pdfIn PDF document text
    • https://alpinashop.bg/files/dipifin.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/womububapowumidu.pdfIn PDF document text
    • http://hexindechem.com/upload/files/87797920704.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/goribivonemunilukevon.pdfIn PDF document text
    • http://myslizdrave.com/soubory/18870542398.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/kogemanagegogol.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/28864746317.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/wodumawumenagosamezu.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/gezuxiroxozuf.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210919034542.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/gilepaxudagebutosopijoba.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/59152438227.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/58960249003.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/15093399128.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/danevopibidujo.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/sapujimeg.pdfIn PDF document text
    • https://photofetimages.com/13964061366.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/bolemedone.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/8d5836b1de3d5ea2fffee72f9fd0aa7a.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/89741967461.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_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 10640 bytes
SHA-256: 121eaf7b5b12c468c50a768130fd5bc7bc8f6a930129108a3003ae9a8433e21b
font_02_sfnt_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 18548 bytes
SHA-256: 03af26dd0ecc8df07221a91ced2320b188f56b7e40b6b1c34eb37ebb50bdc608

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