Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b725140a1187272…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 09:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5379dfeccc839c713eeed5d15069bf0f SHA-1: bd9fb30e193393c95888231001f45a04164107e5 SHA-256: 4b725140a1187272d8d343b276f60334d01d70f24b9cc211595018631650094a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and a link farm heuristic suggests the document's primary purpose is to lead users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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 http://ineke-ott.nl/keramiek-beelden-imagesfile/xufubora.pdf In PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/66626917502.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/24675198955.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/pizetaki.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/pobazonusevoxiwajegilajaj.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/sirilabavuluzagodag.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/lolajiruzinedi.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/mevavixeviwekuzetuvip.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/kekajewonobufudu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ca0f1706bd48793af098b72515fa85a3/dufetiboxoxexekajidoxov.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/45949190585.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/56109282280.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/jekodufewomodobusuzudatam.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/38573989646.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4dde460d5---31521614382.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/2536005808.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/duxupin.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/61401971139.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210908061552_Nzg1NTIxMjY3NDU=.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/15524747551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=live+net+tv+streaming+freePDF link annotation
    • 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_off0000d574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 18340 bytes
SHA-256: 2fa904f2ae1c9d968ca914fa79bd9b519b8cc1d96e482d7cd403aa2997ca76f9
font_02_sfnt_off00011d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 10416 bytes
SHA-256: ebf90630fd5e700b8196c4ce6d5576d474d2d4ce040f54939626388c169b1a3f

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