Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9718ebcd5ce0022…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 10:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29c0b8ac823dbf3b011e6472bf495e70 SHA-1: f5c41375619b631e06c39a34b69b5937a12d9278 SHA-256: e9718ebcd5ce00225fb9bdff484929f57c7fef2710d7870f4df22611a7c6cb4a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs, suggesting a phishing or malware distribution lure. The presence of 'LOLBin token sequence in document text' further supports the execution of commands or scripts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tlumacz-francuskiego.pl/userfiles/file/41923863218.pdf In PDF document text
    • http://riversedgefm.com/files/file/81476585567.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/rapemevulojalak.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/rulajebedofijozesoj.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/82880438540.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/52292840527.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/37834326352.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/kibafujudus.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/3198756200.pdfIn PDF document text
    • http://ahknchem.com/upload/files/67598732856.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/riritavofirorozijewepe.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/tawugesopoku.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/28141402263.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a998f3805---nunaxuxetuwilazesurideda.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/kovolujimuwenodajol.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/15054485442.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/40655709520.pdfIn macro / runtime command snippet
    • https://tivicom.vn/upload/files/zobofukuxunu.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/48574822723.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/sopilupupogudulabuxan.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/6821235547.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/28870800858.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090202012125.pdfIn PDF document text
    • http://alessandrotria.aIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=zepeto+download+linkPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/1410177468.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_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 17392 bytes
SHA-256: 4f9c0afcf0bd4cb81657fe0e7222085fae12f124ecc1272396ba6b25f9afb90c
font_01_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001210c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210C 10260 bytes
SHA-256: d749a751aefcda6ae202d08d7e6aca798237637b885f615764671fe6899defed