Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0b56bc3f153805…

MALICIOUS

PDF

73.3 KB Created: 2021-09-08 20:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0580297ef06e108b02c436382bde6c35 SHA-1: 199a8b73075fcba4bbc6f6b8010bcff0ff5c05e8 SHA-256: ec0b56bc3f153805db3b5b3adbd50cfa9ebcc5488d4240de2d01b53b33be80d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external sites that are likely part of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL distribution suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://chcial.ru/uplcv?utm_term=c3+exponentials+and+logarithms+worksheet+a PDF link annotation
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161364d281d5c0---33293534907.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/sujepekegunulom.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/wufewexewizobavekevizo.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/vewarosujazotegoze.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/19089495406.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/koxagikini.pdfIn PDF document text
    • https://deepex.hu/hirek/files/71961833962.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/94032346672.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/74107494827.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/20703741345.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/24775140734.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/96605803604.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/47185248177.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/pojeke.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/16700135265.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/49652663460.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/jedenuzumu.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/wikavov.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/tijutos.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/49407910953.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/gulirupigemarejuka.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/jegojidiki.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/21989507439.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/38931730004.pdfIn PDF document text
    • 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_off0000ba4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4B 11320 bytes
SHA-256: 64f716851ed9e0f198425b3755cce14d253edd83a6a5e8941ee2f7c37f419740
font_01_sfnt_off0000d4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 16456 bytes
SHA-256: f703461ec110c7b7a6f01fc2654dffd6647bb717c9c60634a757f85ea34d594b

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