Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c36943cfc8b98e…

MALICIOUS

PDF

77.0 KB Created: 2021-09-12 06:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1156d67bdddb1ea8f5067f2999a5eb1b SHA-1: 6d022ad5de6233433c18fd63da6fbce638dbb7d3 SHA-256: d9c36943cfc8b98ecb7562d3f7252b050e64e371a85e7bd09df885a1f3092ca8
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and acting as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://uceng.net/_UploadFile/Images/file/79445250325.pdf In PDF document text
    • http://infiniti.e-library.tw/uploads/files/fewudigasij.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/56315028183.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/26826092871.pdfIn PDF document text
    • https://angem.fr/userfiles/file/4353639621.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/mavitigitaneniwuwidigakog.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/gotepifobapalumifiziwexex.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/71717015845.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/78957379105.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/19187401593.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/garowowa.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/dufile.pdfIn PDF document text
    • http://mamam.by/upload/File/file/42270882387.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/21483106943.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/murudinu.pdfIn PDF document text
    • http://ruresept.ru/files/file/25365732220.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/29245604163.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/74079566304.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/78459942743.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/78911953068.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/7896376865.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/86506967848.pdfIn PDF document text
    • http://jarosi.hu/files/file/tipod.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109030149304697.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/kiruxevojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=stream+my+hero+academia+two+heroesPDF 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_off0000c501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 10760 bytes
SHA-256: 5e56857ed81ecbb6f6f2b1046a5f6086ab63366e0b23de18b27e39f63d2a8ae8
font_02_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 18408 bytes
SHA-256: 473f2a5af817d4f2e6e8de2a699349216dea2e3a60ef0997fb3a5076ae979c03

Open this report in the interactive analyzer, or submit your own file for analysis.