Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b453f08b8e82788…

MALICIOUS

PDF

88.2 KB Created: 2021-09-11 06:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: c91eff8cca1c08b81fac4911419413fa SHA-1: 2282996aa2c2b3e38376b2734c98ff0cfa3fce32 SHA-256: 4b453f08b8e82788985a68732094d38de4dfae92625d80439bc355377a0d9adc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, attempting to trick users into calling a phone number. The presence of embedded JavaScript suggests it may be used to facilitate the phishing attempt or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135b51d227da---duxakopelurezebutagafit.pdf In PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/jalasomokuxizarijejozabe.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/lasisoputalodum.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/vejokite.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/9158427306.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/26303499803.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/volirarumetep.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/73446305018.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/bigegivob.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/93380141314.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210901_DA35505721C65823.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/zosuvojonikako.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/kuvinagosujemame.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/43429846205.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/77639453723.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/dobaxuruj.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/nugosiguwivepeluguko.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/4299244635.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/bapokuse.pdfIn PDF document text
    • http://alvitraders.com/files/78195008076.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137195252362---xodowamebiwaxaj.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/gudomarib.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/fividivavasetovajulal.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/vubupesapapizuj.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/1759935005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=strike+force+heroes+2+without+flashPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/61858488047.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_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 10804 bytes
SHA-256: e686cc64c9d7b93e00a8939d13ef7b01e565e2bd9552f31f2b26a8df0a960f80
font_01_sfnt_off00010152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11964 21700 bytes
SHA-256: d081c5a54afccdf45cfd1a402082336358d0b9a07ce995a968171f003f308633