Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31ac5aac024267a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 20:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a67e0e3c32775931cee240a212231cf SHA-1: 51a840e5da07b2ec9c7d27c530237d7c48dd8d16 SHA-256: a31ac5aac024267a79d8dc07588d6c9715efce3afdb1fc428884739f3e13e595
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high density of external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the execution of further payloads.

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 https://crysiq.ru/uplcv?utm_term=pokemon+heartgold+cheats+rare+candy PDF link annotation
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/16186096090.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/86841146272.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/visobusadodivolukusika.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/boviweliweferimagewu.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/labavaketaputamot.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/pukovapakeg.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/28791987802.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/60067554166.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/forokuzegofaxafovo.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/danigelitalisapomal.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/mofudibenosatetab.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/60602690622.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4d5c607300fba499f89c4fe6eef68298/gabafiniposewazajarejato.pdfIn PDF document text
    • http://apart1day.ru/file/guzuwuk.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/fonezisanobitetobugij.pdfIn PDF document text
    • http://acelybio.com/upload/files/duwudapuxerezane.pdfIn PDF document text
    • https://alohasafaris.com/files/xesalamotelo.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/71230960937.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/95736913711.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/mabajotor.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/vezawejenasum.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/56369544579.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/didopenezolijuzurigujuju.pdfIn PDF document text
    • https://bak.vn/upload/files/bifavub.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e1797de547c28c49c190e535c8603f55/definokatikepo.pdfIn PDF document text
    • http://c-six.it/userfiles/files/80976538150.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_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 10932 bytes
SHA-256: 9e39090bb214b4fe8cd5d224500ce880df04457dcd957bec308de6ffdff20d18
font_01_sfnt_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 19200 bytes
SHA-256: 88a852270dbf7da5596a96bebd8143699785b00f1a8bcb97e930ab8388d4fb0b
font_02_sfnt_off00012c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1