Malicious PDF — malware analysis report

Static analysis result for SHA-256 5651dc74a8261916…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 01:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c0f2d7b337cd5ac098406f1ce97fe150 SHA-1: 5b7a25446ad6af8a53f85d0272c605a5f4935129 SHA-256: 5651dc74a8261916bafdedc18864a83cfc4169166684a080d7d8b136ff8e7c16
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external links and the PDF structure align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuppersbusch.hu/userfiles/files/rosotizuvazi.pdf In PDF document text
    • http://worshipedia.net/sites/default/files/file/gojesolil.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/93665965909.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/vuvufetujizoweju.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/nafovagodajixoduzoguze.pdfIn PDF document text
    • http://home-plast.ru/foto/files/gonajasig.pdfIn PDF document text
    • https://dafelia.com/files/69769017153.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/45223988042.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/3855355174.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/43062248176.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/68615917916.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/jabujunatapajetisijepu.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/1645916644.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/86362093596.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/pudurutokutowukelakewir.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/48562880180.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/fugobelitodize.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/i6fi675c4mdldkk40p271ai9uv/domunubomepogum.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/fibonowubelujuwirogapebo.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/buzegadolejibajo.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/85555926095.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/56622160338.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/basoxefigunusojabavarus.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/25812357826.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/96302036253.pdfIn PDF document text
    • https://jin-ji.com/upload/files/55978739409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=grey%27s+anatomy+project+tvPDF 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_off0000e296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE296 10780 bytes
SHA-256: 97c7dc16ec06e214334e3e8da32ede70ace4894ce7f8d60525134ec5abb365e6
font_01_sfnt_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 18548 bytes
SHA-256: e13e620aa8c60a532db860a43692d2f0424caeef71e4bd816ca3338562630c82
font_02_sfnt_off00012bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1