Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e825482bf8f49e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 03:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ffbf659e370a085f36010b87e549a8b9 SHA-1: f2e3738eaa2c156d75f0bac39e0e6e73474c650f SHA-256: f7e825482bf8f49eabef1358ba03898fa4b78a763c37edb93383bc5e453009a3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=cara+save+pdf+di+photoshop PDF link annotation
    • https://ms01bet.com/contents/files/61424275713.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/35476007592.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614676005188d---mumoz.pdfIn PDF document text
    • https://wrd13.com/force/file/90329972135.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/wewonom.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/15467521235.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-2/20210902021708742164.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83915370100.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/jegoketozomurevulipijikar.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/5860633761.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/62950224563.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/lewugozegejevulodakesofu.pdfIn PDF document text
    • https://foulardfotografando.it/file/wapuvuniseririn.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210919_BC4DAB70C725D246.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/16732847220.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/xatisapodusomu.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/juwilozuwizukelanalezed.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/debav.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d48ae735c---lerazu.pdfIn PDF document text
    • http://epicridesnepal.com/files/muduzalamovomukogusofa.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/gokufabigosomekivudafuka.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/23145418720.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/76460221304.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_off0000d2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 17300 bytes
SHA-256: b85708602582e5b8beb4112d926ddeb84d112b52a0996b0e137ce480453896d3
font_02_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 10540 bytes
SHA-256: 6e2159adc81f7755e8f0b7820e343666807b5ef8f5e67737f9b35117f6f84db8

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