Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c42b5f57889e7c8…

MALICIOUS

PDF

74.7 KB Created: 2021-09-10 23:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c25bf15fb2dd352bc4ce7aa4d4a0aef5 SHA-1: c27b1dbd68f5dabff95fc9ca3d33dbc30cfe6881 SHA-256: 9c42b5f57889e7c823216ea08755b790f732075b136243fce0f67b79eec013a3
126 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. The PDF contains numerous links, with one heuristic specifically flagging it as a link farm on disposable hosting. While no scripts were extracted, the presence of multiple embedded URLs suggests the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b442e59f---vozobizegonurexisu.pdf In PDF document text
    • https://vnjhanoi.com/upload/files/75252507372.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/gizugeluzutupukasul.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210907164423.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/fiwuminipunerepojolal.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/lawaberik.pdfIn PDF document text
    • http://dd-eng.com/files/files/pedaxuzu.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/potitopegufufopifivodi.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/tetozebu.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/21169656524.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/15592422134.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/44347746338.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/foxiputazataxigidi.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210909231815.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/kujilesulebix.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133b9376b4f7---54461893541.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/sadurinusukudunuletijaw.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/muwupipuworexu.pdfIn PDF document text
    • http://djpress.pl/Image/files/ropamezojujalewifuv.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/43323350130.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/736754844.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/43103171216.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/nuwipapo.pdfIn PDF document text
    • http://stefani.cz/fck/file/74603640013.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/liruna.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/keratimigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=jurassic+world+streaming+indiaPDF 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_off0000bfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB2 10892 bytes
SHA-256: fca694de3bc849cd114f1608ce775aa85b90cba641fb45def00bfed951a53fdb
font_01_sfnt_off0000d8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 17128 bytes
SHA-256: 30db01c5018e59d8f435502ac1f02fdb32744bb88a444658e8220ff43e295490
font_02_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1