Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee6cb21e1932959…

MALICIOUS

PDF

79.9 KB Created: 2021-09-12 19:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5adb2088fa6e20939d58bb35c30ec25b SHA-1: 3a1ffaa10329ed5681a73c667d6ac3be17ebbe93 SHA-256: 7ee6cb21e1932959620fd105c4f0b0f30f15c3a7cd2f7f4116a73396ca08e3e5
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://essuances.com/ckfinder/userfiles/files/samifowakewelida.pdf In PDF document text
    • http://rhondachem.com/d/files/rumidolomixikofugex.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/puladarowelewiwajopakon.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/fegixefa.pdfIn PDF document text
    • http://ccadl.com/files/20210909061708.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/ropawarawonur.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/mimapam.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/xanixegibafiwuve.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/25282965807.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/68490837784.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/vuwaxebimonokuvalu.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/nidijak.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/39142115067.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/3071341852.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/91012599574.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/sawig.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/69381188919.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/tudenopepilodubun.pdfIn PDF document text
    • https://koratspring.com/upload/file/20165772960.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/35538150314.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/darexuxojimodo.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/tukelexus.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/wagujomofa.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/bedenavilagupufinebopin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=baguio+zip+codePDF 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_off0000d41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 17900 bytes
SHA-256: 24cb830773eb014bca4eacbfdc0e26f567bf590a9cdd364cabfd6978fc1a7145
font_02_sfnt_off00011ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE0 10384 bytes
SHA-256: d9dc6f5f132254f2d9edfc9017ccb738144d33b5b69275ad4bb871f8329134f9

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