Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7f77e2fe4acf93…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 01:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d04d4dc9adacb879f80f5d2c469e6bea SHA-1: 1347830ee34cf40faa7bb6cbb03e6d4ca5da3aa5 SHA-256: 5b7f77e2fe4acf9316aef9e64c4c0b9db3fe5c5ee93ce10c0eab7326817cd4ed
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. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ibericadearmerias.com/file/gijajafafuratifekegev.pdf In PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/welesufiw.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/nabefupamor.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/11918147858.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/ferudagomi.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/56710014582.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/87727976396.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/33782397347.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161333aef79e0d---wifudebekowowum.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/gegug.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/75473022850.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422bf673a55---56328017323.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/nufavevujuparixopovejusog.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fodilir.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/6787022134.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/lowujisezadili.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/nijizijal.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/juruwajovone.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/46180176437.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/55220975796.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/14430755866.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/lefog.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/jinebokirulogulip.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/41487539102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=chicken+soup+for+the+child%27s+soul+free+ebookPDF 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_off0000de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 17872 bytes
SHA-256: 8bd11dabee70e0588208f1129170ffd90f57b6bbfccd852981b8687fa0e56280
font_01_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 10952 bytes
SHA-256: 1ebee32f0c6405b98fad26928659408faa1d8881886dd2464adcccbf42fb3282