Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5a47e1500c3e96…

MALICIOUS

PDF

77.0 KB Created: 2021-09-21 18:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5d6a20fb80cb07a80dcbd6e923bd972 SHA-1: 03baade3963806723b8be0607121f78849066e51 SHA-256: 5b5a47e1500c3e966b0ee2c996f3ab26a5686b867cba19387b25727d62079008
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, suggesting it functions as a link farm or redirection mechanism to phishing or malware distribution sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using disposable hosting for numerous distinct links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://smidgel.ru/uplcv?utm_term=heer+ranjha+punjabi+movie+download+720p+filmywap PDF link annotation
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79671506243.pdfIn PDF document text
    • https://ms02bet.com/contents/files/36494350475.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/17456880310.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/turiluwanuzerewopelume.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/buzululoxasajelozun.pdfIn PDF document text
    • http://vejwun.cz/images/86635274047.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/xevefuzet.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/gasonoroxogimesu.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/82529495672.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a9e52ec82ca0b1793f0b81a44d5ca762/novigapob.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/69040793156.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/namuzanoxakulizaraler.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/mexadapimomamu.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/18231745278.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/31261334555.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/xazivaloko.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/74757554460.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/2407880308.pdfIn PDF document text
    • http://esistore.de/userfiles/file/tidujebagexufofivexivul.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/ninolomupeto.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/sizapigik.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/49527298425.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb996616df---fikifopexinem.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091723513780554.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_off0000c4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EC 11416 bytes
SHA-256: 13c37c626f0112507a9d4f0500022b10c52b66c528c2670fe7836526269b7a1e
font_01_sfnt_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 17832 bytes
SHA-256: 19ba97421081e89e4ea23bcd910370f9b4793836747ed743e9baf2b51b6988a2