Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b09ef930bed8658…

MALICIOUS

PDF

100.4 KB Created: 2021-09-16 19:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 81d7ada5e25e0219d5e9b0e856f12a05 SHA-1: feb3568e52929ece26094730537c4643942314b6 SHA-256: 9b09ef930bed865804195467ddaf4b40f993d8d838be03a307786d53a9603c97
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of external URIs with UTM parameters further supports the hypothesis that these links are intended to track user interactions, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cructi.ru/uplcv?utm_term=android+os+update+apk PDF link annotation
    • http://seidels-mineralienwelt.de/images/uploaded/file/41819016342.pdfIn PDF document text
    • http://furniture83.com/upload/files/kazenomekuvodal.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/bisixurozir.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/88319100861.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/jogizudijike.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/joboteli.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/32961315370.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/kemupebafaxemuk.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/88797299233.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109041410159281.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/dekolevupedasidetitemape.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naleluginaxevexi.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/83912554438.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/xobamawuberidud.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/lebolovokatujixiditof.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/92557524387.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/26743629150.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-16/20210916072724990696.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf92b7d45---wuxarix.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091222383473499.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/1790423457.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/jodisekubirixotejaw.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/dabizaf.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/89463094633.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_off0001237f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B96 10512 bytes
SHA-256: 4f482d60ef48f5764fc0a086bca8834b655ef901d9b17b86f7b344baa4249a91
font_02_sfnt_off000153aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153AA 18520 bytes
SHA-256: 4c593e2b1d31d99f71a08519e8bdbe156ebb1ebc133a8bb016bab2a0c0f6b98b