Malicious PDF — malware analysis report

Static analysis result for SHA-256 30677d5c5768519e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 06:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c871e534cdc5e33802f97d935f782d7 SHA-1: d6cf2380a952e21ed4e1c803292a8ec715a1afe2 SHA-256: 30677d5c5768519e4d78ee46150d0c7c437295bf7bef4f54911f0af1160e26b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of many external links point towards an attack pattern involving luring users to malicious websites, consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=transfer+files+from+pc+to+iphone+bluetooth PDF link annotation
    • http://studioarchperissinotto.eu/userfiles/files/xuxagusokitodon.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109072023213587.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614407673f5af---53203737905.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/futunivutaxujitig.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/xijepuvonenivimega.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/pelaz.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/6385709316.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/xemezameretibogizepoz.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/85913860767.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/36444443840.pdfIn PDF document text
    • http://lg-palette.com/upload/files/xoripugifaduseb.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/wakazowodexurozupufe.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/dozikojaj.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/jobafubipepa.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/4830739466.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/gukoxakezamulizosamijo.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/84979888062.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/sofumanebajaguvivakid.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/75947690898.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/18371996595.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/76324251162.pdfIn PDF document text
    • https://tsolisp.com/files/file/fegavi.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/zisigejumolufuvazaga.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/pujasoramomomawekixivubij.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/bexitomapadezileke.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_off0000d481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD481 10948 bytes
SHA-256: 67be8a17df2d07de06f06cccb6c0afc43a39d1b3876f141c94791e7ddbb1cb0a
font_01_sfnt_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 17296 bytes
SHA-256: 1d414b3675fd51fa678a45e2fac4669ebc8f222ba449198f2e1f86ca9fe6e2af
font_02_sfnt_off00011a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1