Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b82e77a3ce450a8…

MALICIOUS

PDF

78.4 KB Created: 2021-09-08 19:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc32731dbdfac3850bb38cad63a7c899 SHA-1: bf0cce81a8fbb69717018dd90a7f40f69beaa5e7 SHA-256: 8b82e77a3ce450a8124d82ffa71d337133e9741970fee17b4e53050b523a5307
146 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, including one pointing to a raw IP address, and is flagged as a link farm on disposable hosting. ML classification and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous outbound links suggest it acts as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://crewmak.ru/uplcv?utm_term=buell+xb12s+service+manual+pdf PDF link annotation
    • http://oumkua.com/userfiles/file/zikizenujogabefesin.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/98519145549.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/rijenetafaxepapevene.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ee9ad65dd---98223526975.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210904_181201.pdfPDF link annotation
    • https://monyetjoget.com/contents/files/79605997901.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132517a3d767---robil.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/76266068847.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/sakekamibawodakid.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/notapamanobuzaganexizumar.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/93155704406.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/raxaxipuniz.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/35840731309.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/75085202086.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/gebalapewifegofovodebi.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/15550554212.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/50896115614.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/90277888121.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/guzex.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/93842809828.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/12185533089.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/fotezul.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/xedonakibunanaj.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_off0000d028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD028 16168 bytes
SHA-256: ef063df6af1def68604e93233f95ba7efd7675a2f94a94c8b945ceb45a74675e
font_01_sfnt_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 11196 bytes
SHA-256: 425c8ce2d99f3ebc9a1802c04ad53fddf8cd40bacf7e283a423bf801d4725b29
font_02_sfnt_off00011451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1