Malicious PDF — malware analysis report

Static analysis result for SHA-256 04449c4cdc9a203b…

MALICIOUS

PDF

86.1 KB Created: 2021-09-12 23:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8c1444fbb159abd07059ebb662a8c67 SHA-1: fc9f45f1a0f7e10ffef4aa453650a25d81dcea2d SHA-256: 04449c4cdc9a203b423dc575afd58584cc43820eb0ab7111d8ffd8a59a018593
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a potential phishing or malware distribution attempt by leveraging disposable hosting and UTM parameters for tracking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://gastriklandsbf.se/UserFiles/files/46199214160.pdf In PDF document text
    • https://mobspace.xyz/web/img/podborky/files/norilonapejimalinewesaxav.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/kipatokikofiga.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/88518635524.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/2650043776d33b524c2e352653bd507b/kazekawesixofasuwom.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/zewefexadakep.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/xiwipipedojowawepaliga.pdfIn PDF document text
    • http://vititanon.com/user_img/files/zolamusezit.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/dajosajurawobejazubiner.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/74943337677.pdfIn PDF document text
    • https://hoongnau.com/upload/files/28706020457.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/debubukubugarax.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/dibeki.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/24514819243.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/51155071028.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/93343147861.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/29439406868.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/89039582711.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a617027842---26438455748.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210904155204.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/lunefuxifofipenejozisit.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/33633559823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+secret+birthday+message+pdfPDF 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_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 11016 bytes
SHA-256: c3278ccfe5b3bfbc3caf1e535e4fe528341027c8a63ab3b45a6fd490ce644047
font_02_sfnt_off0001186f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186F 19144 bytes
SHA-256: ea013bab40701206a6aa743b3531e34460f41e1cdb4f6e847dce53089f6da174

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