Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3b77299d0cd228…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 15:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ef197d5e95e599641138e3bafbeebb8 SHA-1: f35d74ee3ac2d45d1d3e4d99322af80007b83ee5 SHA-256: 5a3b77299d0cd228c1822d476c6c2940c7aa3fd4eb2510957fd99934707a9b9c
134 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a large number of links on disposable hosting, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://nyig.com/files/file/33970990183.pdf In PDF document text
    • http://hourinkan.net/js/upload/files/55951841178.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-16/fbae2f673bd102dc7b02510d864716d0.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/70549361598.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376945d9f73---67763751239.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/xejozetifuxokuzirugapijoj.pdfIn PDF document text
    • http://konberdbio.com/upload/files/48602168486.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/78525460697.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/tabodawowowafur.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/24180712539.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/tozonexifuwopafasor.pdfIn PDF document text
    • http://espwireless.net/uploads/file/59096782580.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/23401819619.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/17875430068.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wejuzagipufel.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/27644645392.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/8007479516.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613038347c0cb---21862647157.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/82849611943.pdfIn PDF document text
    • http://theponghop.com/upload/files/wuwojukes.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/luruwumenebujofasezudive.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/60168616050.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/lopavolaba.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/38296861053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=weather%26radar+pro+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_off0000bf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD742 16680 bytes
SHA-256: 850b79f4992c098f9f3efe757b2927f6e2e4f26c025c264fc9fc609c6fcf331b
font_02_sfnt_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 9660 bytes
SHA-256: 79beee71b5c89915c15b32548500f5dded1529b1debc60011f865087ad75a932