Malicious PDF — malware analysis report

Static analysis result for SHA-256 193438c868c4e8e6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 05:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9a3047884467cae39415e69821df152 SHA-1: 156b09fae6aa16f42cb376e076343b9d10a4344e SHA-256: 193438c868c4e8e660e9150320a7e5fa830d0c84852f3a84035489de39572536
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number for fraudulent purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=laptop+play+store+software+download PDF link annotation
    • http://talk200.com/admin/admin/uploadfiles/file/82929773970.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613997deae680---51294877114.pdfIn PDF document text
    • http://polletnv.be/uploads/files/zisufigebesufa.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/61156985743.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/35251443034.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/28001054585.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/jasefelagujukujawa.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021091112114994.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/41658680826.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/97253897269.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/zopupafewamev.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/davitapidujusumatabof.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/65528377088.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/58744026338.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/sodamenoxuxezofuxelij.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139abcc74b41---58406523050.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/rejuwuvaleso.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/21579533173.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/tufisomakitusajuvad.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/27005550099.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/52566369722.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/somatus.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109050729427867.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/tosilopodebu.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/1032290166.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_off0000db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 17996 bytes
SHA-256: 65fbe69a53c78267673a780d705d19e6ea5555535efd972757d330bfbf8709a7
font_01_sfnt_off00010a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12277 10556 bytes
SHA-256: a324c72e8ded1d651d448a259983b765c73cdf28af85359f3fb1b7609067c09e