Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9c6e8f8ddd8b50…

MALICIOUS

PDF

87.2 KB Created: 2021-09-20 11:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 652be5d585aed64e39c1b146ecbb1176 SHA-1: be908ec2af34eccf7d12a6e10685940be2f1941f SHA-256: 7f9c6e8f8ddd8b504968977d0a30c57114023315eda0f191f9337c458cfaf588
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, with one directly pointing to an IP address, indicating a strong intent to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a deliberate attempt to create a network of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vibanghanoi.com/uploads/files/rasukem.pdf In PDF document text
    • http://jjc-dev.com/userfiles/file/60440657837.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/79092023760.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/20301526131.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/nadutabawagegusumofinamug.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/vizedujitobuni.pdfPDF link annotation
    • http://clubselectionvoyages.net/images/file/14711555002.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/maxopafezinefajenuti.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/gajaxuramuwupabemu.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-14/20210914104731702853.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021916144612.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/mopagedup.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/72136906236.pdfIn PDF document text
    • https://pindimana.in/uploads/file/14186710406.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/jotoretomatowafofejogiv.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1bb01f512---bagugekigeb.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/busagofiwazijenija.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/purc7tf4vrt0sqpl6v43k2d35m/65096955140.pdfIn PDF document text
    • https://m3nan973ru5-pa571.com/contents/files/wilit.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210914_E547AFD4BB14EC09.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/79526091715.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/37620086624.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/benomov.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/20279706442.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/92008552925.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/fipixanonibetitoxovofoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+android+multiplayer+gamesPDF 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_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 16856 bytes
SHA-256: e7d55632f60d201400699ee8063d660969effed44e6b31b9e7dc5c199d46db66
font_01_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13567 11004 bytes
SHA-256: d5a9508fb1f6736e277726287ea74837b2df90bf81eb3f8143b45eb8c3a19b80