Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd60d45a1df5d393…

MALICIOUS

PDF

87.2 KB Created: 2021-10-12 09:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f960dd1b775ec45afec95c2a86103168 SHA-1: 3e7e0a89d14e5f4cfdffe1a7f4c0165a244b99ed SHA-256: fd60d45a1df5d393c227bac6ad3aa68c10bd63940e6dcccde62d3e0182a7c17b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content. The presence of numerous unknown URLs points towards a phishing or malware distribution campaign.

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://terminal.hr/userfiles/file/vabuwitekufodujovari.pdf In PDF document text
    • http://apicn.net/upload/files/94081935690.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/ruterudefojev.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/25635688947.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/gozapadagot.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///wokiwewagejubebidujen.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/91724630989.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/bepiwezamisofume.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/18813832010.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153b8c76047d---47385565373.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/rolerudivezafijexomege.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/25509440805.pdfIn PDF document text
    • https://ocw.tw/uploads/files/83789867410.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/34573375006.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/wupuruvunutarijojitid.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/29377045854.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/7771926164.pdfIn PDF document text
    • http://champagne-ardenne.annuaire-regional.com/ckfinder/userfiles/files/50037060441.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161480371bb2ca---vemodiwafuvanefilibapi.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/jakuboxag.pdfIn PDF document text
    • http://pay2pay.net/upload/file/5960074703.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/dejetuvamelibebud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/2I9n2o-U8HI/uplcv?utm_term=where+is+16+the+age+of+consentPDF 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_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 10780 bytes
SHA-256: 063bbda12b8349f72b60a22a6b8ebcaf4a1b1b9e370dcd6f5068c6c57afa690d
font_01_sfnt_off000106f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F9 18796 bytes
SHA-256: 28736c9e053b6dc36cebfc851ecef0eb0ee9beacae980f4e6bf7d8345c25136f
font_02_sfnt_off00013708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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