Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfce08dacf1f8d8…

MALICIOUS

PDF

68.5 KB Created: 2021-10-03 06:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 43570a7f55f4c4d81ffee0bc30a85f96 SHA-1: 8bf89bf0a9dddc04376ee51e8da970d0a5bb9236 SHA-256: fdfce08dacf1f8d81f52d63c288a6fe6dec3d08c01f3f484298283ef7efc8c50
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit user interaction, likely through embedded URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/5db6555ce9819369340f3f0858dd558c/xeluwexonazutuborazodu.pdf In PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/gogavesej.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/63192069076.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/30340571645.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/75044852319.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/06bcdf5548f33b6ab7d4fed04cd7f4cb/biralipamijilasa.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/luxuke.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/nitejode.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/kelokiroki.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/5286681272.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/43888210101.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/61027300234.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/71025272522.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/9443260501.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/86931123579.pdfIn PDF document text
    • http://polipack.ru/content/file/suwisiwasejoxakidaf.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/27139575379.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/14437604380.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/3631072851.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/metokejusarebefo.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/84474223929.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/18112332280.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/99993693678.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/wujunilexiworigop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+draw+police+car+for+kidsPDF 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_off0000add9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD9 14548 bytes
SHA-256: bb859dd715e4c8a337fb603411a0acf9fc48b5ac77ad894e3a02f145ff7e4d1b
font_01_sfnt_off0000d212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD212 10676 bytes
SHA-256: 2f4a6b80edaf3dcd421fa6a62aa6f6bc21984def9d8c73c43def41dde114c8e0
font_02_sfnt_off0000eab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1