Malicious PDF — malware analysis report

Static analysis result for SHA-256 2715515dd3c76c3f…

MALICIOUS

PDF

83.4 KB Created: 2021-10-05 14:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bd84f421e8aacdb37c4f441aa1f321d2 SHA-1: 670ca2c326d0188e3b1d2fa3505b788d5389ff0d SHA-256: 2715515dd3c76c3fc63c69b3f3fc23d5c44a58eef815f0d5bb3f511528d43ccc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://angkagenap.com/contents/files/turojuvulojexorexerurere.pdf In PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/fodub.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/maguradinajuvenaduzadejux.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/59334400403.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/85795559660.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/fowekojisonijimavawabo.pdfIn PDF document text
    • http://charivne.info/images/file/vipasubowidodi.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/tavazeliriju.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/36705045896.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/20952193904.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161496bfb05aa9---88718096807.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/53412239277.pdfIn PDF document text
    • http://csc-027.com/userfiles/file/20210927092557_uh8xzl.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/kibakuxunabanobizun.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/vofadadivasuvevavuke.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/lejexezitarexuselelel.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/fopovupu.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e9c7a8746b332e4652d18408934ed834/38022247061.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/nagozuzojimiwojaba.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/gagufeli.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/84284586005.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/gonukaxapupuduru.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/moxupixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=does+hot+chocolate+have+a+lot+of+caffeinePDF 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_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 10400 bytes
SHA-256: 71ab134ac6dc3a414b5100986d094ddfa7c4bd0a66fdc78d1e80f5de4d83d415
font_02_sfnt_off00010b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9E 20332 bytes
SHA-256: 562dad365a39df7406aa923b059418a2799fd70558134390f8a142ecf63d7673