Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4dd033fb55db7e…

MALICIOUS

PDF

83.9 KB Created: 2021-09-23 00:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5019fec36c3b7f385c4cf3fd63f3453e SHA-1: 960e1cdbd42fcd74a7fe2eb0f8317289e337b9be SHA-256: da4dd033fb55db7e153014243577d1fd13439c37e577873679746bdd1a72e819
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, with many distinct hosts and UTM parameters, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an effort to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://xyoaa.org/sites/default/files/files/gifaderisataxoniluw.pdf In PDF document text
    • https://hobbypet.cz/files/file/30681790140.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614094fbe4ec1---64764529788.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/97233593550.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/kupokirinotedebo.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/dogegekaditexijazuturitun.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/zezixopaxusomawopejedapal.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/verebipi.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/mebowo.pdfIn PDF document text
    • http://househouse.it/userfiles/files/3472373739.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/rafibuwajiwijosa.pdfIn PDF document text
    • https://fishuntpesca.it/file/48315434164.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/zemafabugaturug.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/45646193849.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/wejamuninitanedutajur.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/71239937093.pdfIn PDF document text
    • http://gojjang.com/uploads/files/nevepuzidepumir.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/bexotolitedamexoxuxulok.pdfIn PDF document text
    • http://vucert.vn/uploads/files/xajizogogetemuropogasowat.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/rivomupokipifaxoj.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/mepuliribuguguzisebil.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/wulesibakex.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/25812357826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dlna+apk+smart+tvPDF 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_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 17656 bytes
SHA-256: 6adb8db03e976adb18f32090f823437fc6e7b0cd53b1b05f4cac8053ac2372db
font_02_sfnt_off00012bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCC 10228 bytes
SHA-256: 6743f4e9f7f697ddd58827126ac9483ea130120c7493bdd336c085eb3ccf9384

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