Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e662b46a33c430…

MALICIOUS

PDF

83.8 KB Created: 2021-09-23 16:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 77875ab3e2cf67616fe5cf07c1e4a2c1 SHA-1: 9e7785309f5e1d80952b1240061fcaa79fecf953 SHA-256: 99e662b46a33c43016d48764767e476b57abe2fb7191cbf8dd146734e3131e2d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a large number of external links, many pointing to disposable domains, indicating a likely phishing or malicious redirection scheme. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://lotusromeo.fr/app/webroot/files/userfiles/files/lugunolif.pdf In PDF document text
    • https://vinocastillo.hu/editor_up/14845003359.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/7525718902.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/79251906431.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/wejisidipidepusejew.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/47281066038.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/fojerunevun.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/27189789031.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/taxatixokomog.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f61f219bcf9e8a020ae6de63b6868707/sexuxem.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/bajobunotejimepofi.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/23186477071.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/7996f8415fa3aea4cfe5d757a9da8c80.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/wiroguwe.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/tuzorafolu.pdfIn PDF document text
    • https://manenshop.com/upload/files/damazuju.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/moxamejeviliriliwogidoxal.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/gorotubodesidotiz.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210910174940.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161398e52643e0---gotufuzu.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/57239063343.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/wesakig.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/1927609777.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/bagutisekogojige.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/93262275329.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/52394970092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=uninstall+multiple+apps+at+once+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_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 18072 bytes
SHA-256: ce99a84f0fd67749bdeddc3fc64bdef50cbb7e7e43533efb4b6a6d89a852ebad
font_01_sfnt_off00011080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12897 10780 bytes
SHA-256: db677c13f43156456b775754cee19d36cf755d333e61f04dc5c21eeb13bab5a5