Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b2b8f47e4c6474…

MALICIOUS

PDF

67.8 KB Created: 2021-09-19 13:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a66a10abeaa753b927f5878d7ab0f5a3 SHA-1: b272699b03994f17f88ac2f37ee7911aada3308f SHA-256: d4b2b8f47e4c6474c78c3da8c85b02ab71cda2f58614a4a8d9e8e5b052b22888
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many using UTM parameters, suggests a phishing or link-farming attack pattern designed to redirect users to potentially harmful sites. The document body is heavily obfuscated, but the overall structure and heuristic firings point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://philabc.ru/uplcv?utm_term=jackass+the+game+ppsspp PDF link annotation
    • http://ippon.lv/uploads/File/pogosiduzigafujokoxurili.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/70695063538.pdfIn PDF document text
    • https://tadimtursu.com/image/files/levijafenitufanev.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/81489549545.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/45975672382.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/26623893408.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/811616452612fe8323da43.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/vowisujokatatifibiv.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/bipovuwexopilelewosudaba.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/talegijenalobamejotabuso.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/gisagiguzofob.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/67824973185.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/pugoromilitipasopewawareb.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/gulakoxefofumumaforowebis.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ebfda7cda---82687701620.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/74387898680.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/woxozewuvudu.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/33802214500.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/76748532306.pdfIn PDF document text
    • https://ahha.az/userfiles/file/xuvipetozeni.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_off0000ace7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE7 10440 bytes
SHA-256: fdca3af38a10aa1971b1430d85db71c30547b7d7e01d4fb0180b14a21a20b42f
font_01_sfnt_off0000c4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B1 14876 bytes
SHA-256: e381f209280100012e8528ef2b0b5949d24bb5a283455149593d39da5051e2ba
font_02_sfnt_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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