Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2217b4f86978d78…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 15:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff18001453fdb484d9eceab5cf731e07 SHA-1: 5cbd570cb4653e3872924571570024edcbe822b2 SHA-256: d2217b4f86978d78356cc21b4ed43b7363673dd64773ac2674c542e4edd4025f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The PDF contains numerous links, many pointing to disposable domains, and one heuristic specifically identified it as a link farm designed for SEO manipulation, likely to distribute malware or phish users. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites under the guise of providing a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/72638958742.pdf In PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/vovadetibixidime.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/lajasorepiporufe.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/33751109211.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98acca83a---93167084441.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/36627921662.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/tujaxokakilejepesifi.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/53413055385.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/7435199470.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/vulokazedum.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/butisa.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/63775171065.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/87495247779.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///30840702570.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210904004515.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/vakav.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345d82d6d04---60601643298.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/76784213664.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/82222197473.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1630823563.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/13354078589.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/wunuzipukoken.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/niveruxubinatuxusobo.pdfIn PDF document text
    • https://yellowstonewildlife.com/62558996500.pdfIn PDF document text
    • http://ipublicity.cz/data/file/51636073241.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/22487594007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=marjaavaan+full+hd+movie+download+1080pPDF 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_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 17544 bytes
SHA-256: 1fcae0b8b396214bd20bc89cba62aa52483c1283c1a50348a3e2efe61b1b9e66
font_02_sfnt_off00011f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F92 11256 bytes
SHA-256: a29d1c7943db2f716fab0ae2d78570833ef1e3f2237c2345e65e5b61d380ea22