Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca76657597e9189…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 10:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a90ef65813894ed104cd8180a272829 SHA-1: c3a7289296aa3d50e62aa079dc900fe6bf423ed4 SHA-256: 6ca76657597e9189b9b9fd6ea4b21b3838602a494e63b88085bdded6a28ffb77
166 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including one disguised as a game download, suggests a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be instructing the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the PDF structure and embedded links point towards exploitation or redirection to 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://limsurempat.com/contents/files/detukapetavinir.pdf In PDF document text
    • http://montesantangelo.it/files/files/rateluzijexarod.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/74892530898.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/94722820897.pdfIn PDF document text
    • https://ibextrail.com/editor-images/54940724082.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/pisadudodofevum.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/53151963779.pdfIn PDF document text
    • https://ismart99.net/upload/files/waxatora.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/87069467304.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/61815631703.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/36444700012.pdfIn PDF document text
    • https://tigapilar.com/upload/files/lazam.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/88246288903.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/golefow.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/33796563634.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/12125116358.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/modubuzivo.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161355744c95b9---39948230178.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/tapez.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/42865136923.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/5k5s1ak66midr642rp68vcoqqn/5283247533.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/28894066617.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/83645605991.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/vobilivizovolev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hitman+blood+money+android+downloadPDF 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_off0000b983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB983 16652 bytes
SHA-256: ed55cd6bf5df6db91cc93183e3f33d6021b2bda64a20a73ab582c426983f3fa3
font_01_sfnt_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 10572 bytes
SHA-256: 72652cb3eb5b873967b0a097fecee20e32853d7ed616dde62d26874c3db74186
font_02_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1