Malicious PDF — malware analysis report

Static analysis result for SHA-256 d923fa5778f12479…

MALICIOUS

PDF

85.5 KB Created: 2021-09-12 11:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41885d16f47cecaf1576c1bfeed3bff9 SHA-1: 607dec63454c42d10b9c1522ccc7ae2996bad0a3 SHA-256: d923fa5778f1247967398f86877f6f09f425582319cf3e24ca5a93965ccd92e5
146 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and IP addresses, characteristic of phishing or malware distribution campaigns. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://smidgel.ru/uplcv?utm_term=how+to+copy+data+from+android+phone+to+laptop PDF link annotation
    • http://vector-luczak.pl/new/fck_user_files/file/pezefijagana.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/jegufawonipux.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/milodonoboxulugiwejuze.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/mededanigelunimupeve.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/2825239032.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/doluwunafi.pdfIn PDF document text
    • https://parkettworld.com/upload/files/popagekatebigasawiron.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/erumoniju.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161365a0c54ce2---piwobenapanerovikimupa.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/21894354508.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/993f45dd0f3df8feb7fb73bb60c620da/4731015451.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/zeluluzo.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/wasum.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/jixoguki.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/gopegazegidiji.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/86648934266.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210903032500106.pdfIn PDF document text
    • http://orthopediedelft.eu/files/53108015785.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/23549429554.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/gixoki.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/56193603767.pdfPDF link annotation
    • http://www.bc-arman.kz/ckfinder/userfiles/files/51704756638.pdfIn PDF document text
    • http://novafish.it/userfiles/files/mogaribudofitap.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/najuniritejisevufigidow.pdfIn PDF document text
    • 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_off0000e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 17620 bytes
SHA-256: 367f5690e1306e4e80eb10304dbb93f74e19aeaac448d7b86b59eaefb6fedd59
font_01_sfnt_off0001168f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168F 10908 bytes
SHA-256: e7bc2f0963652c007554cf1c217bb6063a1f8141937325863126962dbe261e04
font_02_sfnt_off00012f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1