Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6bffa75c55a2ef…

MALICIOUS

PDF

68.1 KB Created: 2021-09-12 19:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 24f6bf6600b47fd4136d5658a53253b2 SHA-1: 0c1f98508298b4eb78723d27a0db9868c0ed3dfb SHA-256: 8d6bffa75c55a2efe64b1e7e259ea4cf78b7caa6ad81355b4e523155e3505469
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, many of which point to suspicious domains and are likely used to redirect the user to a phishing or malware distribution site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://tagoproperties.com/ckfinder/userfiles/files/39954229423.pdf In PDF document text
    • http://dcbestwings.com/uploads/files/mojotuwilupogizeriferase.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/gomarorivinuvutuno.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/jitesovanatetomubeligumap.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/fowibodakimujikawu.pdfIn PDF document text
    • http://k1a.ru/images/files/file/82289046922.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/84dc59e59968a25a7c9aa0449e3feac3/5630663191.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/lezadidunavizejatukojez.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/mupibera.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109060153167142.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/21101490974.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/fodovofalarabagujodujam.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/91191337154.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/96289818485.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/65063386426.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/28785585836.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/vobulesosozovopu.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/22041031681.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/52573605131.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/18651902890.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/dibekoxujitewinifa.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/28876887257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=download+photos+from+android+to+computerPDF 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_off0000ad61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD61 11072 bytes
SHA-256: a788bf7bfc18a5df6f239a04ff48b2849a82e17061e2c45d65fed0cd09b81242
font_01_sfnt_off0000c70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70B 14412 bytes
SHA-256: 0ead725a3119ef2629edbbf016d5322a402ee3cc0204f7d143656e036f19e66b
font_02_sfnt_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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