Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cad979357a8409…

MALICIOUS

PDF

71.7 KB Created: 2021-09-10 01:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b33b2a5b680f09a236f021fcb9a0e60 SHA-1: 35168392adbd2f9a10df5a0f272caa16201abe79 SHA-256: d4cad979357a840931681251037d73f66669fec09ebaaf0a5be0e75db50a9fa2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to one of the numerous external URLs found in the sample, which are often used for phishing or to download further malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://csc0851.com/userfiles/file/20210903232732_fl9e5w.pdf In PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/90923056941.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/zugap.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/josaxas.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/nesagominijugigufuwilabej.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4821fc3d---26432901422.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/xotomifevuxa.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/75734276732.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/jaripino.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-4/20210904221328340819.pdfIn PDF document text
    • http://orderkai.com/uploads/files/12331132709.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/serizawikevijavunuduj.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/luxugibimewasesob.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/84586451601.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/lalegedijozipezobenakigi.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/kigixiwunedovusenato.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/zaxojoza.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/digosulelivokumi.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/67288370867.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa75a4a2b---radigububetim.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/lazekufasovezenusefonene.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/guxitazanibawomu.pdfIn PDF document text
    • https://icbacademy.com/upload/files/48775511707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+find+dcim+folder+on+androidPDF 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_off0000b6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF02 10548 bytes
SHA-256: 39eddee6f7c8de64e873a5d691671b57ee58ecd473e9adeb163b6ae198097a0c
font_02_sfnt_off0000e6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 16456 bytes
SHA-256: f2483a3f06c9e3f507cf2b06e60553a22ab8e5aebd78824ef5fdc263f8d41056

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