Malicious PDF — malware analysis report

Static analysis result for SHA-256 429980b1ed3fd0ed…

MALICIOUS

PDF

71.7 KB Created: 2021-09-21 06:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4566039ec45d3a60850ca88a13d939fb SHA-1: f1a44ee4d2265e8576a5080d0f431875692f2541 SHA-256: 429980b1ed3fd0edd71f1bfe4c8ea77bfd023b748aa7b7adb0bdc5fffdb7c1eb
166 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm with numerous external URIs, many hosted on potentially disposable domains, suggesting a phishing or malware distribution scheme. The presence of 'LOLBin token sequence in document text' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://adirondackseafood.com/ckfinder/userfiles/files/55492565815.pdf In PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/66780847885.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/5891036803.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/fusuvolaziwadi.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/minunuxawidof.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/wolodusemogutozop.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/laliwifup.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/negiwe.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/wunuroteteniwexaz.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/busafafixevuvamo.pdfIn macro / runtime command snippet
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/bigodipubafesexoz.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/voxamivis.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/bidobikukopidew.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/60927564420.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210903_6033E3F5B7A1BF08.pdfIn PDF document text
    • http://machin.kr/userData/board/file/fukugibixosow.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/8106919875.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/040110262165.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/tebajalofijofo.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/xilun.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/87315892654.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/26822529478.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/fokanerivopise.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=night+sky+iosPDF 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_off0000b879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB879 16496 bytes
SHA-256: f31a0e3b726df6ab28df3eab7471f778cff3d4a4c0947b450bedc3086532e2f1
font_01_sfnt_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE6 10024 bytes
SHA-256: 7d8ad5eef5d1236bfc8cdc2fdf1846e7c1f0ddea6ed60075b95e6e65a5a36c64