Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdb73c60d127339…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 18:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce230b6f1ea9e4c6236747622d0924a8 SHA-1: 7ac78189aff0d4f33a586ebde6e0d0e4be729f4a SHA-256: 8fdb73c60d1273398a82132ff1179abe765f39585e91290de574f000f10db8bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://idcla.net/upload/files/18536618292.pdf In PDF document text
    • https://hchoanglong.vn/userfiles/file/wixigazafu.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/gakate.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142207491992---mazipamitubarifeme.pdfIn PDF document text
    • http://www.polni.si/Images/files/69873525630.pdfIn PDF document text
    • http://geodez.com/pliki/file/53000887776.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/fefedor.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161422828af414---vezotezurikunez.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/dazigivozadojotafew.pdfIn PDF document text
    • https://steammining.com/userfiles/file/31112589925.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/48231396828.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/43298459973.pdfIn PDF document text
    • https://tivicom.vn/upload/files/92940004841.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/4610086920.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/tofinase.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/nafura.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/dazazozasugofega.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/40784415133.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/90808212088.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/jobesufa.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/fumagusefetuba.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/vubaxuz.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/rafowujepuvixiratexivawo.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/wamamozud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tamil+audio+bible+free+download+for+windows+7PDF 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_off0000d858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 16564 bytes
SHA-256: 1343731ce902dd8280eeefc8cefb1b17bd3d185fec7db3b6e966c90cf55eeb92
font_01_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 10756 bytes
SHA-256: a7a6358a25c46de674b21a0fe6ee5557eed6f4098c3817b7814a558dda5ec9d2
font_02_sfnt_off00011c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1