Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadc804bb8798548…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 04:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9aaa7fdb190260d78b2a4475680ee8b9 SHA-1: 03fd560905461fd2debf424aae1fa74810ec2a05 SHA-256: dadc804bb87985488f24f432ee216aee7dabd679daec05eb4b526119e258f233
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external URIs, many of which point to disposable domains, indicating a potential link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is designed to lead users to harmful content or facilitate further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://suadienlanhhanoi.net/upload/files/duxunuxo.pdf In PDF document text
    • https://repetitorebi.ge/userfiles/files/gogozoxuvel.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/befuzetiragawodex.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/jiteponemifoworixej.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/2847661377.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210904_21F3932A3A8D257A.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/95995576591.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/62903421117.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/50889441770.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/5237718167.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/rakegidijemozik.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/wegejugevesokuwewijuloz.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/dosekemowimewusega.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/fd0755a65a3ebb4d06bd6c363c6416ff/tipor.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/palidamepux.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/45818950477.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/17832488507.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/24265149236.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/6318695779.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/xedasamusijajuzomujaxof.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/35040801180.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/tororiwijokidepavi.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/68329460538.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/56480634843.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/73358876659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+restore+album+on+androidPDF 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_off0000e123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE123 10724 bytes
SHA-256: 457ce5727d42d2cca58cc2389ce27327a76c5064075ca1b58cc66035fc92fe0f
font_01_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 17220 bytes
SHA-256: c135143fbb11941385f796ed688696cc0b30d398f539ba2b2cb904af9881e5ac
font_02_sfnt_off0001266a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1