Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f8cf43fcbc38c9…

MALICIOUS

PDF

70.1 KB Created: 2021-09-13 18:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f45be5042f7da1ee98c65e7fe5d2f322 SHA-1: d415975b7c132b9d89f04ef258ea3155c00eeb74 SHA-256: 47f8cf43fcbc38c91b495fff1aea92124346c9247473d786c1daab966d3f2154
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links point towards a common phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=eat+before+or+after+morning+workout PDF link annotation
    • https://bonekarusa.com/contents/files/41991644714.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/sokepikexigigijukenuravo.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/banitabite.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/xusosu.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/43145064300.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89287747548.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/25900257492.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021921051533624.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/fudulujapativipowobeza.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/tixidasulezo.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/xavisugapo.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/80192290510.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/95547893639.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/23457405824.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/sogukofodoboror.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/20031429640.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/vutosovalonabokugedenalas.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/51697758302.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/15786725886.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/rivedujibamuruba.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/66847536164.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/xonekalubadan.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/bipigoxorodujawineg.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_off0000b42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 15092 bytes
SHA-256: df445e23b422d87b0992b911a9d61226ae65d4a4082e40c1741f2745d8a9066b
font_02_sfnt_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 10744 bytes
SHA-256: 90cb2ae40cd015d22194f4c93f96f832939ca2d854f2cbe978e3bf429e41953f