Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c395f641e7614e…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 06:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec737973258c2fb3575e82a613f8d164 SHA-1: dbfa7557fe291bc4d9fc0bd6d5a5a59a05ddad30 SHA-256: 92c395f641e7614ee5eca1aa63358927f7628e4614f587e262a84f1356f7ed33
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also includes numerous external URIs, with many pointing to unknown or potentially malicious domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tongrentangthai.com/UserFiles/file/falifukixumasikut.pdf In PDF document text
    • https://dgssu.com/upfolder/e/files/20210916024811.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///podozugokub.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/60796537191.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/85036215713.pdfIn PDF document text
    • https://majubesar.org/contents/files/91768304189.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/46257420422.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497bf76634b---nijufageluvunape.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/vitagolupaxufugemuperis.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/wanitafa.pdfIn PDF document text
    • http://olympusflights.com/files/files/62491835835.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161381b7582c04---puzutedorotamuzogegizizi.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/xufamasino.pdfIn PDF document text
    • http://hrudolf.com/userfiles/kizololexufoliba.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/74725460278.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/69200860266.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/fijabejuviriro.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/36956548599.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/rukekifurewivuwumudan.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/86803461839.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/buxozidurizaxijonuwuwixuw.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/54946188760.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/55300177896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=types+of+ui+componentsPDF 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_off0000afc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC9 10508 bytes
SHA-256: 720757699417486b2aafef6071feb124aa1ae2809ca5fdd6e46298ee7e586887
font_01_sfnt_off0000c7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C4 17412 bytes
SHA-256: b91c4b6cc9cf87561ee378d607d3039095b3f25ffae3980904e231ddc1c714fd
font_02_sfnt_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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