Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66147aa2db0d921…

MALICIOUS

PDF

70.6 KB Created: 2021-09-11 18:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ce0839c78cffed91e9bb166424bedd9 SHA-1: b19d9a31e5223917a390af1e4e1049111ad6d945 SHA-256: c66147aa2db0d9216a1b6d5d63ee0db6a0b4046c8ad579ff019fdf9021fa29e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URIs and links, many pointing to unknown PDF files on various domains, suggesting a link farm designed to distribute further malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138670278747---93673753691.pdf In PDF document text
    • https://detector-billetes.com/Imagenes/file/bovigugenog.pdfIn PDF document text
    • http://www.centralperdana.com/file/pafufuxagijafisab.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/sevedasamuxada.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/51867763264.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/27834285320.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/lepulazavebason.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/xafinurikuperifopopari.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/66762588762.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210907_173132.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/zeniludekeno.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/zenafarukumumewoko.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210907_143D63F4AC8AACFB.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/fuvenosowopovini.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/purexawukelijujifato.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc907af810---dusapasosusaxiga.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/sakonologef.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/xuwofonegawifowipedofare.pdfIn PDF document text
    • http://gewald.ru/content/Files/80995869030.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/30103762724.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/47455225852.pdfIn PDF document text
    • http://szcftz.com/upload/41463182419.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/83528734915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=boku+no+hero+academia+movie+release+datePDF 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_off0000b333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB333 15728 bytes
SHA-256: 30fdf261e9614c088fde72b8f4649661b771e1c5a4fb7e94435baa477aa88f21
font_01_sfnt_off0000db72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 10944 bytes
SHA-256: 0925e0c01dee56f88506b892ae52b404efa0b03adeb448c02f4852841ab3d105

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