Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f22f53ef1972ead…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 22:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 344437b7f09109705242c2261bd8dbd8 SHA-1: d2bf1330384d5d037b3c91d0db04b7e0a11500f0 SHA-256: 8f22f53ef1972ead6ef050655341ff0c0692696ef13e6715730109757b823caf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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 http://tsraccountants.nl/mailing/images/photo/file/positojemileleri.pdf In PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/dadebafitomeligozu.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/52974351504.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/wosilotabuviduvipefow.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/22297077690.pdfIn PDF document text
    • https://badrivishal.com/media/wuzokisinuresa.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/99836909287.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/14330546895.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144bce7725b7---97029344954.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/66973442024.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/79022426979.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/ramafesukekefi.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/40701740312.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/18221122414.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/96025111277.pdfIn PDF document text
    • https://alpinashop.bg/files/44059331066.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/43164555832.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/tuzebapifalufo.pdfIn PDF document text
    • https://plasy.com/uploads/file/wokojove.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbc83187f5---34963305002.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/97434407257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=using+silicone+oil+with+acrylic+paintPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E7 17668 bytes
SHA-256: d0b05f2f6aae323cdb63a6d27924b3d8533567f014ee86e0ba4ceac834f73914
font_01_sfnt_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 16476 bytes
SHA-256: d6e59106b6ee83da0a1815d148185c9cf93640e5878f956a64e356a9f65dbb64
font_02_sfnt_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 10860 bytes
SHA-256: 868ea3142db729c4cd7de16c7de87ff2d5e6867e0800850b31f892bb9bdab7d6
font_03_sfnt_off0001238a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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