Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f488d3f87c3b25e…

MALICIOUS

PDF

88.6 KB Created: 2021-09-19 08:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 978b8b34cab11e2578e0d82362fe2140 SHA-1: f9f2cd6c7ba1f524a23ddf068abe0fbb661204a4 SHA-256: 2f488d3f87c3b25e7b10158aa46467e44474e20e18226c1ed517bf5ef0d105dd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, strongly suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://kibbkw.com/uploads/file/jimawimu.pdf In PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/93424718079.pdfIn PDF document text
    • http://unseretochter.com/images/file/87009798831.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/toziji.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/8634674619.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/54798681053.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/90550391236.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/14364016329.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109131510277490.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/09608a1ed61db447eb6a18f83a16c58e/78012883814.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/rajiratoditupe.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210916_210122.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/ronex.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/rusupalakukolemebaneve.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614260e9cb697---22352287638.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/zufusulerefafegiratafal.pdfIn PDF document text
    • https://tsegypt.com/file/8321787177.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/44789496722.pdfIn PDF document text
    • http://gapp.fr/medias/files/nasoruzumamaxevokuzegofu.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/15155820416.pdfIn PDF document text
    • http://cityfate.com/files/files/11353051065.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/pawawedixuvizedutabu.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/6127304313.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/tiwotevez.pdfIn PDF document text
    • https://educhina.mn/editor/files/94907018155.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/64824916453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+improve+internet+speed+on+iphonePDF 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_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 17980 bytes
SHA-256: 252aa309c32852a2e210bf454a5ccbbdd393d88ae0cacec9bef4707b383fc816
font_01_sfnt_off00012430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C47 10592 bytes
SHA-256: 1e7e13c65709f44da621d0bde651021f9046ced2d78a429232d65c5d01cab16d