Malicious PDF — malware analysis report

Static analysis result for SHA-256 487110afa1c548a5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 04:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: b198c445dbfdb64262726c5059ca00f6 SHA-1: c1a0a89a0c7f7ded56a30e5ab0119d069e77300c SHA-256: 487110afa1c548a5c394ededf34def5b8d315ea744542abb3db9a337882b54ff
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://klinok-saintp.ru/files/84228702994.pdf In PDF document text
    • http://misr-consult.com/userfiles/file/sinizamamimovi.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/85040690044.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/duboxudizufetu.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/93655798684.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/sosidizawobesofafosajow.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/geduzutofotejokevazal.pdfIn PDF document text
    • https://polaria.cz/images/file/mapupegov.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/38246346613.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/sibeluzokepo.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/donaz.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/56849911015.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/40689053525.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376e02216fc---4719577554.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/18571221569.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/84108480583.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21089197457.pdfIn PDF document text
    • http://sro52.ru/uploads/files/44117263034.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/61034052662.pdfIn PDF document text
    • https://12shio1.com/contents/files/nimetinepuzubetonivifukel.pdfIn PDF document text
    • http://contua.org/userfiles/file/zivezilolofozuje.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2692306357a465412726dcdff73c8fdd/mixobamajuregasujedetaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=animotica+pro+downloadPDF 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_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 17668 bytes
SHA-256: 4867397e55034219453460bfe367a821b2bd5a08bdc45f7958e8ceb96f0c5369
font_01_sfnt_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8F 10440 bytes
SHA-256: 4a1294ba96e1dca2961a61d33a17e1135361faeb1108654fda0fe989608dc793

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