Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2ae122bd4471f4…

MALICIOUS

PDF

86.4 KB Created: 2021-09-16 03:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39d5b3042e47fa60d0b1bb87413dc54f SHA-1: a9d2a44cfa0b2679c344437767d529c49fb13430 SHA-256: 1c2ae122bd4471f487f5be89c5a5d56ae1d0c9779692dd82418df07f16cdcb8e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is structured to redirect users to a large number of distinct, potentially disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://texasbordervolunteers.org/userfiles/file/kabutolavavarevovos.pdf In PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/wazitujigemakilele.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/butowujozivek.pdfIn PDF document text
    • https://podimercrm.com/img/files/75809645944.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/diberekobatepixuzal.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/gerikototerowoxokobivev.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/53713701216.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/25434763710.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/lolezofin.pdfIn PDF document text
    • http://xsteelstock.com/d/files/34242237533.pdfIn PDF document text
    • http://mylodge-naoshima.com/93796144577.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130fba8bdd2e---11147693228.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/zenob.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/mewokoxikiwutov.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-16/20210916061421165897.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/45862877905.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/10159190314.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/28629500619.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/91976507967.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/79313264815.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/41335192432.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/27819669920.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/pisajajupuri.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210911_095911.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/porexagukozuradazudasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=kafka+diaries+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_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001008c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008C 10208 bytes
SHA-256: 6ee9d8f3a0c7dc64cc399931b8f616286c0deef6a42f1b6f1fe9cc91a4aceccf
font_02_sfnt_off00011786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 20452 bytes
SHA-256: 65b8034d42a0cb84fed5c317e9e7e5c32e4d874691d27d49324b45de35a2dd26

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