Malicious PDF — malware analysis report

Static analysis result for SHA-256 44388dd5b3473f31…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 14:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd82ff215d3281771acc871bc5b1dbc0 SHA-1: 65ee331b6642be7a394bfec94d840a670d65a3be SHA-256: 44388dd5b3473f31c749c70fd2648397b76146f464d6b287e99f8e7c6aad922e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites. The 'SE_QR_LURE' heuristic also suggests a QR code might be present, further supporting a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://pokwuttibut.com/file_media/file_image/file/depetazi.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/donalebuviwosepemijiruk.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/83820959487.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/30199678936.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/jogurisasanawemenuliloziv.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/28930115065.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/25967437777.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/memuzasoresar.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/33575096376.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/25119326412.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/73977185549.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/tumirixudexodusenolat.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/226e705bf04004e7a121b0a0d3c5365b/siwezasogu.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/juxunegokim.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/7917f668d6f3238c56144889aa8d77dc/mimusebuzazekirele.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/65637870587.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/wasegemilet.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142384cbd6d0---gebufasatiboj.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/xesopib.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/xabaxuketakeg.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/13870952624.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/venapapodomimoxogewa.pdfIn PDF document text
    • http://vitccorp.com/uploads/userfiles/file/37364251101.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/nuwerimoviriropupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=scan+a+qr+code+from+a+screenshotPDF 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_off0000db24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 18204 bytes
SHA-256: 9434c010199bd93d24d57f6bc83650082ea2bcc9c1aba0398869a71dc90c30b6
font_01_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001224b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224B 10824 bytes
SHA-256: 7b6e170acdd05d98d75a9f96ccb93b8cfbe0ae7eb847861431d102c16e7e2334