Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c9bc7c92cf54bb…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 10:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49957e80123b83ce8cbc3cfed7b54ee2 SHA-1: 7857c87cd413515580d169eb2e82475693649942 SHA-256: 39c9bc7c92cf54bb200a75357e72715a68f63eb99bfe2e3560230acf0ca0cf60
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user to phishing sites. Heuristics for MFA/credential harvesting and payment redirection lures strongly suggest the goal is to steal sensitive information. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://crewmak.ru/uplcv?utm_term=transfer+data+from+android+to+laptop PDF link annotation
    • http://nrgmedia.hu/files/file/xawirikolulakitipexiwu.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/61363557004.pdfIn PDF document text
    • https://bunianco.com/other_files/File/vebopisuvamaxo.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/wumatogumulabojezubebi.pdfIn PDF document text
    • https://basisnomor.com/contents/files/10355425952.pdfIn PDF document text
    • https://pepsima.biz/files/file/ravakutorose.pdfIn PDF document text
    • http://safetruck.gr/images/file/fozujiroxirezazajumumi.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/tasokiruroxirewitajoruw.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/55930348169.pdfIn PDF document text
    • https://angkagenap.com/contents/files/54757902578.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/30172766713.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141f261892dd---54555532813.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/xerozibavaxo.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/55213828579.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109171726505121.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/gokosovalekir.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/vudavuginuwigavaluminuboj.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/28564772058.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/vezufivimezirixe.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/10626472725.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ockfn5diprljjdiad5fvp9u9c2/jururonow.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/zesukuzubilosogewo.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_off0000d192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 18792 bytes
SHA-256: da56e6545ce75eda6058408e55ea91e021a66f8e74bd2ae1e022709a9e535cf8
font_02_sfnt_off00011a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 10624 bytes
SHA-256: f0895b54915158199cac3572d7ff457fb1dc892f7eb3b1830da5c26388cf3333