Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffeb95bab925ef81…

MALICIOUS

PDF

72.1 KB Created: 2021-09-09 02:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 88db9fd9b61a2f64d722cf91bff4c2d3 SHA-1: a1b3575c5b49eea0f8b5fd4773589dc5b9eb5e29 SHA-256: ffeb95bab925ef8199d1f5e96e9416416c1fd4543382fb2f6b5732f791c8a41c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://samngaimarble.com/html_upload/file/degogakexatil.pdf In PDF document text
    • http://bjjiffy.com/upload/21708253061.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/marabarovekavepoxefo.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/kanobaborezowivasasefu.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/viwaxidozexamipiriw.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/4643843333.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/6368509812.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613325cf81584---61443857995.pdfIn PDF document text
    • http://sin-hua.org/userfiles/fulotusija.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/jowepawebowumo.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/99219946707.pdfIn PDF document text
    • https://ikansambel.com/contents/files/61774800825.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/zinelomonifoxi.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/zabimave.pdfIn PDF document text
    • http://travellerisland.com/files/47348793604.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/73185756203.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/mazuluvexovipal.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/455edeac477eb891a330e27dac1d4bf2/laveputod.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/mobirukuzijezizede.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/499741797.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/wexafezezejuwakotafeboza.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/lobogowuvewibozutefuwuben.pdfIn PDF document text
    • https://kimcert.net/E/file/26739066595.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/51875296928.pdfIn PDF document text
    • http://vecsecity.info/editor_up/robebimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+download+apps+on+fire+tabletPDF 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_off0000b7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DF 10708 bytes
SHA-256: cbda690c43d278532d03a701c3ff79fa77952ac29db7ffd46f0dc0f4b0191bce
font_01_sfnt_off0000d059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 16516 bytes
SHA-256: 1d15a2d809de6d7605ae55b3ef2dae9c82e82bb3f70d155345fd1ad88ba3049e

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