Malicious PDF — malware analysis report

Static analysis result for SHA-256 204b7c80d2a174a8…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 03:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 725e15fd0a5cec740229275071352b59 SHA-1: 1ab4cca2deb53200d67108fe87e22c8e574cf5c9 SHA-256: 204b7c80d2a174a8c173388d04064bb402d848d1acb0d454a02ad7ef0ed10c08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ermolino.mebel18.com/uploads/files/dupupifexemuzasemozo.pdf In PDF document text
    • http://le383.com/uploads/files/witopu.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/73806663703.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/42215516439.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/guwape.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/36600277717.pdfIn PDF document text
    • http://cichanski.com/Upload/file/39534563570.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/sijisupakibikuzop.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/46570418641.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/gukezifebuki.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/rixituketelew.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/78092750724.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/98387224752.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/82817522955.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/pebumetuf.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/wolazixojivusujekuneve.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/41804569495.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/sakotibofonazebuku.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/57589567989.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/22652511869.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/32394578676.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/032cd3pqghotel0gqpfqko3973/zikebunorebisebuxuza.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/26299937560.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614162251df05---59050885550.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/31579470844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=god+eater+psp+romPDF 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_off0000c382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC382 17116 bytes
SHA-256: 112b13a2ed169794aeef326edf9f50b19024f4780e8af23bb5ce4b0717949451
font_01_sfnt_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 10352 bytes
SHA-256: 76cfac5d9bda4e3740ce0df24b95993be8080762c414577f8fa453c57298f453