Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb081b5a76f8f5fb…

MALICIOUS

PDF

84.9 KB Created: 2021-09-10 22:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5791d4c20f9ddc1318bd549c83ea8cd5 SHA-1: 523229151c4b1ec5e6b0d9cc9fbac8a9f77ceb64 SHA-256: eb081b5a76f8f5fb7cd1bff0ddd72bfd4bfb80eb7b6a2ba60149b1a2e11c40be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that often leverage embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://tucsokszekszard.hu/images/news/file/wujurepadonekogixezog.pdf In PDF document text
    • http://kovospm.cz/fotky/file/pezoka.pdfIn PDF document text
    • http://teifsepahan.com/files/file/15840304896.pdfIn PDF document text
    • https://bselink.com/userfiles/file/17604185524.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/34861ba788533e28cee460232d35de13/vodexuluw.pdfIn PDF document text
    • https://digicpictures.com/downloads/gomorazawokisebes.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/33537677744.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/51872621317.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/84220171300.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/86328292921.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/48775332156.pdfIn PDF document text
    • https://lordoptika.hu/files/files/93807210399.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4daf734fc47aa52f2f3100dbf87cf50e/29958220430.pdfIn PDF document text
    • http://robedecreateur.com/img/files/venipemovabafukomelaxo.pdfIn PDF document text
    • http://w-mill.jp/images/file/sudow.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/torowijise.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/17851233072.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/28230810214.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/bokutajefuteter.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/kewonegeponotodez.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/81501154525.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/pejuneb.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/fidafalefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ghost+detector+radar+pro+apkPDF 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_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 17164 bytes
SHA-256: 521dff8104a8de8ea0e82f85537e9be6569479578605c64ad37a906421be6809
font_01_sfnt_off0001163b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E52 10500 bytes
SHA-256: 0616e2951ab1babb6e02c736b03e6bdbc717a4e124f064b5929bb2cc353c04c6

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