Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa0363c0ebedb31…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 08:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e41d35161d862789a108f8e4e24532f SHA-1: ac234f95a64d62015ff7be11ac33272aed1646ad SHA-256: ffa0363c0ebedb3177a4d2e1da22da8402eeaaca751402a2f805a78889295490
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. The presence of numerous external links, many pointing to PDF files on various domains, suggests a link farm or redirection mechanism designed to obscure the ultimate destination or to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://gadesign52.com/uploads/files/202109131502574409.pdf In PDF document text
    • http://wtmongolia.com/materials/file/sewibojiwix.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/josivebofevodezuruxuxuj.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613f26c28ad5c---31259749712.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/18941397653.pdfIn PDF document text
    • https://baptistfriends.org/media/zodagamujudamopiduk.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/90946031516.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613005cbc66b2---87198026178.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/5290275806.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/warawozozawijabedo.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/wekidopu.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/51739591594.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/rodivibisusizuzefodajel.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/pegejinenifolegoxerer.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/fuzupi.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/gosubonuripew.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/potuvibomivefi.pdfIn PDF document text
    • http://zerosquareonline.com/file/82916523924.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/81815506657.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/vevidiwavevidotij.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/fitufurusejeliset.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/13412003233.pdfIn PDF document text
    • https://tekartltd.com/upload/files/69334647009.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/gufux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=natural+language+programming+examplesPDF 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_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 17680 bytes
SHA-256: 21e9754b92f33d8467414e383a2b6b06e98b834735b41c70532a1173a50360d0
font_02_sfnt_off00012db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB4 10772 bytes
SHA-256: d4cc5a01dab5afe6416cea9b30e57d41d6df1ea4dc9f2643201c3b7f200ebc68