Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfddcb19e262f60…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 00:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f64be455576db69847d774d34869995 SHA-1: 15d9d155b170d68ca63ac12478f3e09caf96f9c9 SHA-256: 7cfddcb19e262f6030939eeca2ffcba79c77a4342376f0525c17c15bab137ecb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that redirect to various domains, many of which appear to be disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature. The presence of external URIs suggests the document is designed to lead the user to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=root+pixel+3+xl+android+10 PDF link annotation
    • https://advance-pack.com/editor_upload/file/zuzuneb.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/91323770018.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/81433915520.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-4/20210904083348840075.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/20883176573.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/susudobifejejetopijaxi.pdfIn PDF document text
    • https://j26clean.com/upload/files/vofunobujokopos.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/77444861180.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/vapumabubuzexevo.pdfIn PDF document text
    • http://rnralpha.cz/res/file/gulosefadiruwixekimasune.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/simifasore.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/93001095747.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/wekulikekokugef.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/tat6jegs9naspplku16790qekr/musewivumumipuxagumelekaf.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d02f473c1c---vafadologa.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/zuwivofibarud.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/peruvelezevi.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/mowabugemudekam.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/1583361206.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/ritixodekukume.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49788492101.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/lidasubesetewexatuvivi.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/widugewuxifisaxerunupunas.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_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 18168 bytes
SHA-256: ceccc6f6206033aaa8858dc747fc47e9731cae8418502252ebdefd58affe24a3
font_02_sfnt_off00012464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12464 10708 bytes
SHA-256: 9bb46345af3b05ca62e3dd54e90b827e94a0194a2a1057450329f801bc02b586

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