Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc91aedef3948708…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 14:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ddf25289c18f4261d52e988bf7bac88d SHA-1: d04168914360d7219164cbc05cfd934176fbbcea SHA-256: cc91aedef3948708b2482d34e47d2607b92b047df4e282f7659b77dd5d4afeed
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, as indicated by the PDF_JS heuristic. This script is likely responsible for redirecting the user to external URLs, as suggested by the numerous PDF_URI firings and the ML_NYX_PDF_MALICIOUS classification. The presence of many distinct hosts and links within the PDF points towards a link farm or phishing attempt, aiming to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/6785489419.pdf In PDF document text
    • http://chaukitchen.com/uploads/files/81460997306.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/bivabakovurorogovikagu.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/66979779202.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/xujukatosul.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/1459222121.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210901_84D3739D8C6997FB.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210910170629126.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/damedipugexinabinasix.pdfIn PDF document text
    • https://pecsikult.hu/files/file/79769227119.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/10395694940.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/jizelomejetofuja.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/mowamema.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/nixolovazejab.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/togokefefewakodosu.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/2982824642.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/83970622101.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/getosipo.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/mumobixorifotapitif.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/wuvikegelalobozawaxilez.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/28659086070.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161367ea589531---varunetirobifepurizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+phone+number+codesPDF 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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 10696 bytes
SHA-256: 6e757310fe9907c8a8a688db9eef20d29ca53b96b85cb4a26fed47ebb7f3f4fd
font_02_sfnt_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 17920 bytes
SHA-256: 7af56658720696814f56d3151131aa966f5cb8b937178764b2951b4544a6c64f