Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fb6b57bba5e1f2…

MALICIOUS

PDF

85.3 KB Created: 2021-09-16 08:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6df1566905a136980a0208c56f0be96f SHA-1: ca524b08a561a37189842ba83ce5854301afdbc9 SHA-256: a5fb6b57bba5e1f2bccf0d46dbd902dc14b1f919fa4bcae68d12b3727c3e1fec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The PDF also includes numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://health-bridge.in/upload/file/79710677206.pdf In PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/67807573435.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/59125108552.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/83441369689.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/tuzunoxasafo.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/47154400379.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/pegegujutigagegijagototi.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/57239063343.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/xetalipipifijadep.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/38863247843.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/3621860734.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/jumawitopefuwutejiz.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/gejazumus.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/kikopiragopidopa.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/luxewoxemez.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/68322535719.pdfIn PDF document text
    • http://pasted-radio.de/web/files/kekosuwojevoxoxolipege.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/kedej.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16307189626406.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/zasasaxotitudix.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/mafosuraxado.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/77156382770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+music+player+with+castPDF 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_off0000e677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 11060 bytes
SHA-256: 4f501d96d7b5e84ed04727839e05bcf63bdc2070f964341a77c86653cd651169
font_02_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 18488 bytes
SHA-256: a4bab7f146ec7889d6cad01dcd0e4e7570c9cd92042e42a8ec0e1dd361af3eb2

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