Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af40ddffcecf8a1…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 17:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d4964248f27b5dcbbde4a275c54a5069 SHA-1: f0af94ef09f8fd3b25c2e9a60b47a2b473d5353e SHA-256: 5af40ddffcecf8a1680b24186b93b01dc3c148b2590becda4a33d08b942351a7
134 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external links, many of which point to disposable domains and appear to be part of a link farm, indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://cructi.ru/uplcv?utm_term=naruto+shippuden+468 PDF link annotation
    • https://egokituz.org/files/galeria/files/loralukovinutorujikepa.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/47878084716.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/57343620595.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/jetemifujoka.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/40891410423.pdfIn PDF document text
    • http://flexa.cz/docs/file/51412077370.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/74430691763.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb41eb544b---neladuseraxokin.pdfIn PDF document text
    • https://hoalavender.net/upload/files/widarexipelurixub.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/wekalotozijamom.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/4999935541.pdfIn PDF document text
    • http://labotinnghia.com/img/files/37663371290.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/56271572454.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/13750987822.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/51929678561.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/27824896771.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/48787383600.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/dakerubijanezike.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/vadopuwizef.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec2ff885bb---zuwepemaxo.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/941459119.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/juzag.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/gewiruwerudepuwijedofulok.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/7614389775.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/81307644542.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/fabusozu.pdfIn PDF document text
    • 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_off0000b0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B7 14932 bytes
SHA-256: f5d79de74a065c419be27606d08e7384134c6f01e758b7f1fd4461a856449d11
font_02_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 10976 bytes
SHA-256: b895c9ab5983b6e4ad66d9d9e9f8040233dcea1d2ccadf2c6be2ca19dc90202e