Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90be9a28bb957b8…

MALICIOUS

PDF

68.1 KB Created: 2021-09-30 13:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f47736ab9a367a5ba1ee37775c9a5a9b SHA-1: b34bb27cc5ab28281faf10e21d4e77e29d90b814 SHA-256: d90be9a28bb957b86874580e441982f812d1abae2b55f14eab493d8d2b63858f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF exhibits characteristics of a phishing lure, including a small file size and a high likelihood of containing only an image with a clickable action. Heuristics indicate it functions as a link farm on disposable hosting, directing users to various PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138e582088fb---pisufome.pdf In PDF document text
    • https://topclassgardening.nl/images/file/1686513825.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/60358616778.pdfIn PDF document text
    • http://rayanchem.com/d/files/29583368595.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161466cec846aa---5358913745.pdfIn PDF document text
    • http://www.77ice.com/upload/files/51914140913.pdfIn PDF document text
    • https://coil.hk/upload/files/48850696065.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/69365831968.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/57510411211.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/87516340860.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/44065143513.pdfIn PDF document text
    • http://birdwatching.sk/media/file/15161818352.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/13179272273.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-23/20210923193540363329.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/fijejizuxizutul.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/44826957187.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/sirafupomijumupana.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/xasaseloduf.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/22280068060.pdfIn PDF document text
    • https://baglab.pl/galeria/file/84673777630.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/duledetisukolo.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/77509327811.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/21932494069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=meaning+of+classroom+assessmentPDF 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_off0000af31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC748 10672 bytes
SHA-256: 986b1a651fb462d1a680d396ca8f386fdc8a132a6d0fb7e43e2161b8286f5767
font_02_sfnt_off0000dfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB8 14024 bytes
SHA-256: d042ccaaf0f5d5fc9481d88cc097fe4c32a18e09b69c52a12133a0389a9646ac