Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f5b79bfdc23654…

MALICIOUS

PDF

78.3 KB Created: 2021-09-21 03:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3eaae3db8d213ff7f39c979191e4d71a SHA-1: e76a7145428521ae85eecf9b6ac6b3b42239956a SHA-256: e3f5b79bfdc23654967c33943becfd717cdb146abc473f5ff92046cc58c70b23
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many pointing to potentially disposable domains, further supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://residencecarlofelice.com/userfiles/files/pomilowepopebumorik.pdf In PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/gujidizajoginuwikasa.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/wujaseleg.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210910_142536_194.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/wakavuvuxifemaxobigiwaja.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/gevafoxafotemesetul.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/29841649446.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/44710684581.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/43445266563.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210917120443_xc39ag.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/mepegawowowukonakif.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/80568223726851e53106538c5d4ae3c8/55994836779.pdfIn PDF document text
    • https://resicolor.com/upload/files/nepiruwilirenuxukunodel.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/31547761208.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/poziwukapitipovenop.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/vojibogaduj.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/namawodev.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/bimosonovevudetedul.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/93300634757.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/sedis.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/9961520514.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16144ffd0bd7d0---senizoxo.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/49181127688.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/75715624538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=2k16+mod+apkPDF 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_off0000cf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 10148 bytes
SHA-256: 179034794a37f2ed055510c78057998b331316e40a3893d51aa61205132f1476
font_02_sfnt_off0000fe0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 17636 bytes
SHA-256: f4e44a76fda5cb46a07a4a9fd0cbf58177166fd5562190857e2de08390dedd46