Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8309ce051e90136…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 11:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d6c3a2f17e807ea6e482c8d5e3ad953 SHA-1: c42e87e5583b7e61201ff4c7038abfc4522a8472 SHA-256: c8309ce051e90136ce0a29494d60fd00021b11a86acb63d0f6e74b626c931005
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple external URIs, including one pointing to a raw IP address, and is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://queure.ru/uplcv?utm_term=periodic+table+with+electronegativity+pdf PDF link annotation
    • https://lotte-ppta.net/beta/assets/file/xalididaj.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/26934511464.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/93159481131.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/pewazipegufojovoduxafe.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/74916229768.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/76832354462.pdfIn PDF document text
    • https://granitnet.hu/editor_up/89305191345.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/40099269174.pdfIn PDF document text
    • http://01host.ru/userfiles/files/31445804557.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gajuxobijijixeso.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/bipuganaditokowabomezoli.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132449be8f52---86790083320.pdfPDF link annotation
    • http://europavloeren.nl/siteimages/file/jubejuvapodixatuwekivor.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/tisadujerifulanenab.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/39436221135.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/jifobojo.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/59259839112.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-08/images/files/nasifa.pdfIn PDF document text
    • http://i-physiology.ru/upload/mimazetapekolikotad.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/vogagirajemegeron.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/fepakenawadanogol.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/76389725270.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/rifiwakipimibigumirige.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/89323560822.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/taguxakefekomid.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/231271153.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_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 18020 bytes
SHA-256: 1c9fc739c2f53be9c5f7f30ee6dfab96da9cfc4d38b95d6a50844ddda27dae5c
font_01_sfnt_off000112e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFB 11136 bytes
SHA-256: 27340c4740e4316444527fba12868bd1480cf00b9c554437779262937ad94e8e