Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a400dbe0e7b765…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 00:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7698f8c39a44c5dce7a8e1bb7aba9b76 SHA-1: 67c7d3fbe59b39d8b18314d924a93f000525756d SHA-256: 47a400dbe0e7b765f8d01127ba0f215881430464690f5700fb79f6de7fcf28de
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://oniceh.ru/uplcv?utm_term=facetune+for+windows PDF link annotation
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/871a2ded2e77d0defcf9c1679513e49a/28071894953.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/nixogegorivibunakodepepub.pdfIn PDF document text
    • http://apismorava.eu/docs/72619261575.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/xolobikox.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/4209959500.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/82261343055.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c0e27fe3---duvegomet.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/wadenarotabewubi.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/jetosurebepa.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/kunuwivuduzabamuzawul.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/139930500.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210914050914.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/wasinoxanaputan.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/65033456347.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/71738363277.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/legubapekav.pdfIn PDF document text
    • http://gist.adrianlechowicz.pl/userfiles/file/fakovosafawifekezudiwit.pdfIn PDF document text
    • https://dacola.com/upload/files/tipajanobumuniwu.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/58777166551.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/tanoxajobosojema.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/53594772948.pdfIn PDF document text
    • http://nineslash.com/user_file/file/wuxobavexir.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/vuxelelurerifer.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://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_off0000df71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF71 10588 bytes
SHA-256: 9fb8a8ac092f2cd82ec65ac2bb9b8f0da30b84835e5f7b35bd80477019f600fa
font_01_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 16976 bytes
SHA-256: b32c670a9240372c55bd8d8cf41738ddb22c31a9159b2342eb793343c4b5d5ff
font_02_sfnt_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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