Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e44f5d3cf838e2…

MALICIOUS

PDF

67.7 KB Created: 2021-09-27 02:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01bad4f01fa5d2b6d8c54b916a83751e SHA-1: 2a541990146afecfdfeb12a6ad8f1f1f71225f70 SHA-256: d3e44f5d3cf838e2740693f6b04c04d3f5b8c6fa32aa2fd55621d2581e55b148
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into believing they need a password to access an archive, likely a tactic to bypass security scanning. The numerous embedded URLs pointing to PDF files on various domains indicate a link farm designed to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161510119ca46e---wodonajesazubozokegik.pdf In PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/47977781475.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/71671705082.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/juguxiwesaponezobogabe.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/19673384926.pdfIn PDF document text
    • http://webursitet.org/Files/file/sagalatewobixugejonadezip.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/juturuwululizugode.pdfIn PDF document text
    • http://195exim.com/datas/files/95395230219.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/puwujisupepusu.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/30568418228.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///81731136361.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/40862318624.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/tinibopesozavolun.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/18718568212.pdfIn PDF document text
    • http://enewind.com/pliki/file/sixonulitubiva.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/59701341313.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/13603406573.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/70514709317.pdfIn PDF document text
    • http://seasplendorpetro.com/userfiles/52254653425.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/reseratudugar.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/vutululimeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ymca+roblox+idPDF 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_off0000ab78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB78 10252 bytes
SHA-256: e08152c18180a03b6e36309b3353334d602543d18b4d2da208259be3a9a8b7ec
font_01_sfnt_off0000c26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 15516 bytes
SHA-256: 50d8dea594bfc2d17a53b35161324828aa90e4fd7721449ca08a7be03d84bc5e

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