Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd891c6b2057eac…

MALICIOUS

PDF

97.3 KB Created: 2021-09-18 14:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3bc64e197006908ac7fe1965f5002a55 SHA-1: bb879f633f0bbd28cf905e86a2646f4f7b91d7fa SHA-256: ecd891c6b2057eac7b6f3c9c45c084215a62ec25889eec084f37421a80bc7844
134 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests a phishing or malware distribution scheme. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=galaxy+s6+edge+disassembly PDF link annotation
    • https://calienglish.com/ckfinder/images_store/files/nawatoxefozawowuretikupiz.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/gasuzuvubitijinesutomata.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/84870020821.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/munujado.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/81509952570.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c0egroptun5m26obmdgma59bm0/29226866943.pdfIn PDF document text
    • https://durimawar.com/contents/files/96746679216.pdfIn PDF document text
    • http://panova-art.com/files/file/defewifolik.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/42232649969.pdfIn PDF document text
    • http://esistore.de/userfiles/file/8504277867.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/nujojil.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/melebij.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/netefobozuro.pdfIn PDF document text
    • http://mfahk.com/upload/files/folekasare.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/nuteworamijejiju.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96fb416b9---3258431531.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///68219579111.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/kotojamidazaxaw.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/muvalububaderezovevanizaw.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/15670707649.pdfIn PDF document text
    • https://manenshop.com/upload/files/53130600363.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/kaparitowojaguwerumutu.pdfIn PDF document text
    • http://pactolous.hu/upload/file/8828708275.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/58997342671.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/pufufoj.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/17170032449.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_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 10732 bytes
SHA-256: f0c167c348826f2cdb1f335317e9b595b8a5118de066c46f0b95b06d20dc8639
font_01_sfnt_off00012695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12695 21300 bytes
SHA-256: 5927c3341bd309a08edbddb019070e2a511e8a0827e46693a51d42102d892e75
font_02_sfnt_off00015f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1