Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4e1eb1a7a5de89…

MALICIOUS

PDF

71.8 KB Created: 2021-09-24 13:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 35b8d1172a041b6b00131b85552f50a0 SHA-1: 5ce48b35d79d96c70c5e3138d26a04a8162351c5 SHA-256: fa4e1eb1a7a5de89b3e340260744ecb938faed9626a5f05de0e31713ec84db0a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many of which point to potentially disposable domains, suggests an attempt to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://unseenadventure.com/userfiles/file/pemuzopunajig.pdf In PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/mepodinevipo.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/24298165356.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/14713421001.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/mefigalaz.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/tisego.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/xikuriludinejisilukada.pdfIn PDF document text
    • http://qdjshg.com/files/file/dupewabesubojisusipeb.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/torozazaw.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/91247345777.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/juveneloniseja.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/89905173479.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/70294176247.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613984bc57ea7---gisokawudesosudev.pdfIn PDF document text
    • http://showdoimovel.com/files/files/92068312528.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/ligezonetomoluru.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/47261847439.pdfIn PDF document text
    • http://balony.dmuchance.eu/userfiles/file/supozosomoxijatagalax.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/matefar.pdfIn PDF document text
    • http://hy-sf.com/admin/upimg/file///4869624361.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/wowinawadafe.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/77483574861.pdfIn PDF document text
    • http://zenithmetals.com/files/81788288108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=redmi+note+10+vs+redmi+note+10+pro+comparisonPDF 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_off0000aff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF3 18720 bytes
SHA-256: 2d57928b2817c243c605ee4a31f09ab08d474de6eb838076f33312404e5c6bdc
font_01_sfnt_off0000e00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 10916 bytes
SHA-256: 7266c3a927f805242fe8d8e5d21a628abf73cd9d1c67e98144d0653fe86e4b71
font_02_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1