Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6cd16cacb907b8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 22:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5fbd25a1adb6685a28ed253b13feaded SHA-1: 06c2de8b24783c0c06469fa2fda560d6592ccc9b SHA-256: df6cd16cacb907b8d4cc9f6ac6ba203527aba26f0e1a4f1536810b328fa905cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely intended to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of multiple external links suggests a link farm or redirection mechanism to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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.
  • 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://stepasidemedical.com/images/uploads/file/jefoponegekini.pdf In PDF document text
    • http://vom-ragnaroek.de/uploads/file/botozararefumasijilaseda.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/morusalifexagegametofe.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/sesob.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/lodulilenina.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/susavijowo.pdfIn PDF document text
    • http://riviera.az/userfiles/file/kumejukososetug.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f797b81915---pegokerovuxo.pdfIn PDF document text
    • http://planbmedia.hu/files/76235989231.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/3558596463.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/85990027487.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/98365437462.pdfIn PDF document text
    • https://phukienbep.net/media/files/43838497306.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/1796767151.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/51207643121.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/lexov.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/ninatunaragefomuxemunu.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/mogovonumukowanudebo.pdfIn PDF document text
    • https://parfumzone.ro/files/file/putazawo.pdfIn PDF document text
    • http://cabini.it/userfiles/files/3023792313.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/lonulisomosizovobenub.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/16573445675.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/55364500873.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/duzizesinidinefitani.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/zerafosonofimokaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=aptoide+tv+for+firestickPDF 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_off0000d318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD318 18548 bytes
SHA-256: 4cebcd2c403c26a15f061bd59de123ddabfd169657603ec8a82433dd0d94e963
font_01_sfnt_off0001030e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030E 10440 bytes
SHA-256: f4bf5429645bb83a2e92f34a03c7d543134d280ddb33da595bcb8eb2e7275e9c
font_02_sfnt_off00011af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1