Malicious PDF — malware analysis report

Static analysis result for SHA-256 555cb2d1a5ad73c4…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 05:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 60254e1ad99901ea3069a1644b0319d2 SHA-1: b7fb84e7ed9568a3516431b05d2e7a3135e6abe0 SHA-256: 555cb2d1a5ad73c4301b3679a95b0d6a7b8b36b5d4adf3ac3fa8c3992e432821
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or redirection attempt. The presence of external URIs and the overall structure suggest it's designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://krisoc.ru/uplcv?utm_term=theme+of+the+poem+ode+to+the+west+wind PDF link annotation
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313509968bd---vapexisasesima.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/74258330371.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/46820971924.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/namorogivekoguruzit.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/xiwevuxuzodevavebirosi.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/33993735479.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/dimamevapa.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612efca42b46d---monigigoporowotibufibi.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/3022662340.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/8852060668.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/padexiz.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/wifexiwelaxufuvadejoroxek.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/datetumekozege.pdfIn PDF document text
    • https://suksesunited.com/contents/files/89241340747.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/jalivaralirosovijaf.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109060049084629.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/41935322617.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210914_8E4C9D8E3ABF0517.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/19846277212.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210917210741_4tlugr.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/92639806824.pdfIn PDF document text
    • http://deauville.ru/files/file/42391641163.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/18991081204.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/57596204885.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/3746608605.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109140155139002.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_off0000e865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 18124 bytes
SHA-256: 520bb3893ea2c89670b4a8daac1a7f29c7e2d1101f0748bf2e8ebe5ee4c5f8e8
font_02_sfnt_off00012f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8F 10504 bytes
SHA-256: adab774049937d74aa471690f1536c7172e31de68cb7057ebce1b97df6e97010