Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61fa57ae25f735e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 17:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26fc38d7d3d47de95146931467975b2a SHA-1: f18ba62cc36e9650fcb66b71c5f3d2db99423d13 SHA-256: d61fa57ae25f735e400b99e10d0d515c5adcb13b01d00f090f742c7636fbb317
154 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. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://at2-turbo-j3t.com/contents/files/57574663916.pdf In PDF document text
    • http://efuegypt.org/userfiles/file/zugowunakijubasavox.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/79844953393.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/98054727683.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/5006234878.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/folavizulajenejugezugofa.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/73197486907.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/81220605719.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/80309530476.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/jabazalilexijujusipaxaw.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/75692278692.pdfIn PDF document text
    • https://bselink.com/userfiles/file/wewuze.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/12201108986.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/towalomanogibiwavesijun.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vomisawumozitekivipulo.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/72961462969.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/51496077002.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/90893797194.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/53049779833.pdfIn PDF document text
    • http://esangsok.com/upfile/files/daxuj.pdfIn PDF document text
    • http://klemanpince.hu/files/file/xiremelowimaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+factory+reset+passwordPDF 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_off0000d177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 10748 bytes
SHA-256: 6696047d8a11941d782b4ffe6e2828efedb56a4f61245297581542c7f69bed88
font_02_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 17840 bytes
SHA-256: 3e55aa3499a4cb69561de1ef168f52f59efbe8bc1d50977c2e27aa5509aab1e8

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