Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbcff4497f08967…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 00:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5fea19ab4bbd057041d7e36a7f3ac35 SHA-1: c46998a45fb64fed843220ecffa01484d8cd1e2e SHA-256: ddbcff4497f08967e510d54fe56e873501e82aa73b0b36441d615611e121b6fa
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to exploit vulnerabilities or redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number. The ML classifier and ClamAV detection further support its malicious nature, likely involving exploitation for client execution.

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 http://prttour.ca/FileData/ckfinder/files/20210916_B21C31DD43D35A67.pdf In PDF document text
    • https://accuratesearch.com/userfiles/file/78037479556.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161379e8a07b53---35256507019.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/zafawadoroxaraj.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/20099731164.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/sezatufurigotopusabok.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/59839403042.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/64183689310.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/45624419976.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///repodo.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/nukuxoles.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/71401903758.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/lapuvumiriwatomobusi.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/fakozotale.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/82717355704.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/79846463091.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/9005057273.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/fubemorigupazudunazo.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/19007164813.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/23275188632.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/xofuvopevuri.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3e4991d2c---watabelodixonojotedalajib.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/98748280580.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/48665633050.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/92621363205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hill+climb+new+version+mod+apkPDF 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_off0000e10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 10952 bytes
SHA-256: 8c7b8c2b9d97bf627ca208e45631a805b9b41bf91f1b276bca59bad7365a77cb
font_02_sfnt_off00011245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11245 18832 bytes
SHA-256: 8ecc7e6f69dea66daae310c4a35f2289ac5a7108fabbd6f4d3e5988820fcaf7f

Open this report in the interactive analyzer, or submit your own file for analysis.