Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c00410fb73b6f5d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-21 05:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e52a3e661c3027490185a718b9d1a0a5 SHA-1: c3181c108244ca19a6ed4a61cd9dcf2721e3fc1c SHA-256: 0c00410fb73b6f5d5103a6daadb26bdbcb8ccac1a1c419e2f1869a005af599bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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 http://alacarte-husum.de/userfiles/file/luwenatidumalebuvin.pdf In PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/dufowoxitev.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/b2gabdu5u8bf4ugpaiekoijm2l/liboluxewubuzu.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/64037767352.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/dakogutefaxiraxefe.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/zamozajetibuvuta.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/98629726756.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/nedafasodunikuta.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/54052808747.pdfIn PDF document text
    • http://teresachild.com/upload/files/85863212256.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/wopojaxopazunutu.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/43191325572.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/28292983795.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/39539780764.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/jojesulofab.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161356d504f52b---rexojerutuvozisaxifebaj.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/norevoxuzuvofuwisigaw.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/43618870230.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/bewemamufanigebived.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/vupigibuzajan.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210909032507.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/46820769157.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/pedupan.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/bizome.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/rezenomawe.pdfIn PDF document text
    • http://transdeliveris.lt/userfiles/file/98932484019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+iron+loftPDF 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://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_off0000d220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD220 9944 bytes
SHA-256: a24b1ea2149d96771546010db27e60b7f0c930cf7859cbf8692f79463d596f10
font_01_sfnt_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 17616 bytes
SHA-256: 8a2e0d32f3e9b4a98180e0caf758b62ba8110acc64af73cc5e00e6d068d6f998

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