Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49d4ff8b352f5f2…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 00:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4a018cb285cae9fae1b3ebb417399d9 SHA-1: 3151f87a56d825d3ec802ff7d4e979524d4ff4c7 SHA-256: f49d4ff8b352f5f2229ee4dce5788c2eda97e8de4da67287fcd40d7d787ab3d6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dakov.hu/_user/file/96676773830.pdf In PDF document text
    • http://patriabrno.cz/userfiles/files/33545085105.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/47562000090.pdfIn PDF document text
    • https://edarky.net/data/file/besepepimuxiworala.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/51046435233.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/ligemoxidiramogan.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/duvodikodov.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/fusafegone.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109082206328237.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d3e351d84---sudugudawijumavoto.pdfIn PDF document text
    • https://brukspec.pl/upload/file/zetolalebisaguvujib.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613174a765d0c---1078020232.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/lixiloruponasew.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/giwinidikakaloz.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/39622753419.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/xitepixupidajazori.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/62284664978.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/48829598246.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/14202486409.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090508555273499.pdfIn PDF document text
    • http://poiskvod.ru/images/file/paxujomokunijemer.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/nalarit.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/dazer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+crash+bandicoot+1+ps1PDF 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_off0000e85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 16720 bytes
SHA-256: 4076ebe28199135222e35699372148a6edb5ec2adc0a7daf7da085aa99ea7a11
font_01_sfnt_off00011389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11389 10760 bytes
SHA-256: bd17b424f317d647b2a3f25b15f279ac6777dff5c92c61f0252f8e7373cdf26c
font_02_sfnt_off00012c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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