Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cb56e004436bb9…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 15:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c3870117d300ce11fec33057593c6e2 SHA-1: 2bdb81742fb7a00854046aa89557c9463f2bb3d6 SHA-256: 21cb56e004436bb9b918ed4c73e69c060dfc1debf487bf8e0baf6ad5de6f2d72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on various domains, many of which appear disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://choragwica.pl/userfiles/file/56725841425.pdf In PDF document text
    • http://demirlermetal.com/resimler/files/kanokuroregogivufuxoxiw.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/33440619381.pdfIn PDF document text
    • http://contua.org/userfiles/file/fasifedagidiwugan.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/banonik.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/87974492265.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/mvmorcik7thjcgnc95fnk240jn/nanupoxabozadir.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/80280074542.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109120936384308.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/36634042179.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a8347df4b3af84d14da00aa3c1075882/84299087808.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210920130804377.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/16557846388.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/45927335164.pdfIn PDF document text
    • http://didula.ru/img/file/98482176061.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/67085934633.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/74616171054.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/68073366486.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/nevirenepa.pdfIn PDF document text
    • https://koratspring.com/upload/file/97881168936.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/17037057637.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/jekomilijepafexunubu.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/suwamigasovasizudawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=which+is+the+fastest+smartphone+processorPDF 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_off0000d433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 10692 bytes
SHA-256: eca0c57aebe9288f2fe280123320d99448966ec51f828911ea419c29b28709e8
font_02_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 17784 bytes
SHA-256: 980978308a7263820e7ac0abd434f83ef4a2e53275766dc8166738026dfdb143

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