Malicious PDF — malware analysis report

Static analysis result for SHA-256 5076aedc8fcd4571…

MALICIOUS

PDF

53.9 KB Created: 2021-09-23 02:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 19e2c76f2aa1b35d645b1011d70c14f7 SHA-1: 623dfe69b2a4b4538d8f9273e7f6b65362e5cb17 SHA-256: 5076aedc8fcd45715aea99b097cfba6bdd9e84c783e39e8f1de6cf067477fc7c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The presence of numerous embedded URLs, many hosted on disposable domains and utilizing UTM parameters, strongly suggests a phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8111

Heuristics 4

  • 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
  • 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://allytemp.ru/uplcv?utm_term=android+11+redmi+note+4 PDF link annotation
    • https://www.tvmreza.tv/ckfinder/userfiles/files/76745463434.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/50854306610.pdfIn PDF document text
    • http://att-na.com/upload/ponaxawol.pdfIn PDF document text
    • http://gaudi.tw/upload/files/nakaguwijizivosazulos.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/68222595879.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/36561576716.pdfIn PDF document text
    • https://angkagenap.com/contents/files/49967915876.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/71091431596.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/80274115140.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee1ae6f09b---xesireketorigukuk.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/6075523267.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/93173854813.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/64664820305.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/89479278940.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/9497655888.pdfIn PDF document text
    • http://cl-pub.com/files/files/79506839673.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/kiwigegavoro.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/talatuzazenejanonuxiso.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210904134129_378230265.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/pepisedurosejubat.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210910011826.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/39924996506.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/tametuvapugukifukibav.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202191707442876.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/agq4saeulo9mmekv7shhvv42ue/nelimixelid.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2A 10144 bytes
SHA-256: 89bdbef948b0813c9904b3e09113a340ddd37b116a80ae8a64a211c3a308813b

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