Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45f4e6288cb2b58…

MALICIOUS

PDF

73.8 KB Created: 2021-09-23 04:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa65d3bb1cd10dc382c2e04ceef1495c SHA-1: 582ade16408311e860fa4c0dc92f1cd7e4f56076 SHA-256: f45f4e6288cb2b589afda2d5ff2d95b3eb7ac05fbd5199ff70262d04556cb815
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or redirects to phishing/malware sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=7+letter+words+starting+with+w PDF link annotation
    • https://ferropula.hr/files/12252602531.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4d6b21093---rumajixis.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/nidulibadaromopep.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/kaxuvi.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/muvoriwisubivizivar.pdfIn PDF document text
    • https://bem-sa.com/img/file/niturelufaf.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/58442561632.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/28462066622.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/50530105594.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/93663998499.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/48842383960.pdfIn PDF document text
    • https://parfumzone.ro/files/file/likawu.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/witupus.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/50390146696.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/xutig.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/megusizudadukelu.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///69010095142.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/56980165320.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/90482034058.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/pevexob.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/punuzaritasakuvamazixomu.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/xazabizofakajut.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/jupamenul.pdfIn PDF document text
    • https://oferta.lt/i/File/xitewokexoruzane.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_off0000bc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD449 17240 bytes
SHA-256: 8cfcac52e0ffd31da3ef3724f0d123abc8f5bc1c5c38ae015f36428b8ecc2c37
font_02_sfnt_off00010178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 10568 bytes
SHA-256: 6e95806c329da256680d991d9ece280d75f155625ec73cd2b6a4665664aa61a8

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