Malicious PDF — malware analysis report

Static analysis result for SHA-256 c387b1c7ae5a85b0…

MALICIOUS

PDF

72.9 KB Created: 2021-09-10 17:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a26daec508764d1984628b0023571d1 SHA-1: 06348e2af05b5a0d9add3014f0041d00c7c27e08 SHA-256: c387b1c7ae5a85b07c5445608b8a1b9e08bb246260c50127f19740c384585405
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to PDF files hosted on various domains. One URI is specifically crafted to appear as a download link for 'WPS App for Android', suggesting a social engineering lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/vurufupiv.pdf In PDF document text
    • https://pellevah.com/upload/files/zamubudegur.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/2783736385.pdfIn PDF document text
    • http://modero.vn/upload/files/lewegusebisotokatefopeve.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/xokefugebuwide.pdfIn PDF document text
    • http://salespate.com/userfiles/file/18161070879.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/newimegesefidusotorokej.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/19207954924.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/vemixivuvavozi.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/pukajigamufetiviwax.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/sokezanamos.pdfIn PDF document text
    • http://tencanpowder.com/d/files/fimajalodanuwijadul.pdfIn PDF document text
    • http://myphamasia.net/upload/files/pilumevotixisozulinupido.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/doregutilax.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/49074354322.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ctafagpm2le476p3fderl66n9d/30557142978.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/baganiverufadomomotut.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9d8861551c274521fb899fb34ac57bb1/dulezugeput.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/gisojonoti.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/xuganumonurit.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/xewoxagipoze.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/falifukixumasikut.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/42464427680.pdfIn PDF document text
    • http://haai.org/upload/file/37999567045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+wps+app+for+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_off0000bb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB98 10348 bytes
SHA-256: b36e6cfdba78a3d530edb915e55b106b77c77f4c23314f7d01e72494ebc05c14
font_01_sfnt_off0000d307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD307 16792 bytes
SHA-256: caf7ddbc2494dc73b7fffa01ac218fea9d839669188e6ffc2f7c52cbe5af0328
font_02_sfnt_off0000fddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1