Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfc3b398ae806e4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 12:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a320cd798770f984a262eabe7f2b96c5 SHA-1: cf5e8073d6a49c5c5b8af0c5292cb3d3f0ac63d4 SHA-256: 2bfc3b398ae806e430288cb5a89c808e9c43bdacf475f0f654dfd13307766d01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users via link redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://doellefjelde-mussemarked.dk/images/newsmail/file/gisaxelobotizurevanaraxi.pdf In PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/biludevugiwizi.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/45870521111.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/92430298658.pdfIn PDF document text
    • http://ned.ru/uploads/files/kalanuxujejidufejokaje.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/35356788116.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/80736620225.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/60136686482.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/daposinanevawesufujotov.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132e3f408b42---62726665829.pdfIn PDF document text
    • https://hotelcorona.ro/files/vewuko.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/31878508293.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/bigogolujebudur.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/buvuwawad.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/rawinorukemonokizidado.pdfIn PDF document text
    • https://superpart.com/files/piximisew.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/47363238930.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/99227460247.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/wubeledaboxiwas.pdfIn PDF document text
    • https://aspirans.com/files/file/45800804338.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/93418874836.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/14817608872.pdfIn PDF document text
    • https://durimawar.com/contents/files/45554334897.pdfIn PDF document text
    • http://elpijisystem.com/file/rimiler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+bold+text+on+androidPDF 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_off0000c44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44F 18036 bytes
SHA-256: 4d286b640786917a006fe71eac311ede02d807b027f7074b0440ab3be598e49a
font_01_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 15016 bytes
SHA-256: 3caf3fd92f27b1d55ec0bff7ebe14d247796bab91f6f6b27282c86250631cf24
font_02_sfnt_off0001195e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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