Malicious PDF — malware analysis report

Static analysis result for SHA-256 a995726717e97421…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 18:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc4c5685d3240cc01810bcf8c2e26844 SHA-1: 11e8dcdd38f041383d87a74fc142f6fc3757e1be SHA-256: a995726717e97421a503a5841b78215620787cde37a614da4a8dce925d18c101
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to potentially malicious domains, suggesting an intent to redirect users. The PDF structure and embedded content indicate it's part of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=caffeine+light+headed PDF link annotation
    • http://modaxch.com/userfiles/files/bizanoronitakele.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/lirel.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/jupotepijoradag.pdfIn PDF document text
    • https://finliz.lt/i/File/firexute.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/75290098382.pdfIn PDF document text
    • https://grnca.org/img/files/files/34326549889.pdfIn PDF document text
    • https://festacontinua.it/public/file/47363313781.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/a880444f36111ee4c1541f094349b214.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/59653815724.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/20470627552.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/eljj8gr9o47vgo5jf15182sbpd/kobezasesusewowafojufapu.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/jaxikusatakobogo.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/09d1nbhmc69n7vin675msv6odr/45406038640.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/virafivedoxazajifejale.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/66292870111.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/rezajolije.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/jijivonajikisi.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/44700166623.pdfIn PDF document text
    • http://kmsenior.org/file/files/wedurozemixarif.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/7011564669.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/nevanowi.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/12429214649.pdfIn PDF document text
    • https://digireg.sk/upload/vovolasisop.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/gibatojovapagejuziw.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/25090011036.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_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 10276 bytes
SHA-256: 6488ec43d4a337b45b5b95a9cfb04c6a6f533fe4a1f53b7816a280132a5ed7d6
font_02_sfnt_off00011730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 17596 bytes
SHA-256: 64a5b99861e8403c63b52fb893d2bd86d0373a37e6481f3554d478d9a560e7d0