Malicious PDF — malware analysis report

Static analysis result for SHA-256 daecc9e9c1517b35…

MALICIOUS

PDF

71.3 KB Created: 2021-09-15 13:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4f9c65cbf54438a36f460f8e6746f87 SHA-1: a943ab76622c2ea02d48fee082bca56a56b89946 SHA-256: daecc9e9c1517b3576dcc50900b366352a097bedc7375fc8d210ad7cb1515a8b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to other PDF files, suggesting a link farm or SEO abuse tactic. One heuristic specifically flags it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users, potentially to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6474

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 http://stellarp.com/userfiles/files/16152052667.pdf In PDF document text
    • http://anpo.vn/upload/files/xariga.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219141859406548.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/15725443667.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/49652172549.pdfIn PDF document text
    • http://homeopathyhk.com/files/boviweladazapofe.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/lijugijogese.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/doxuzamavujavaterabilit.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/94714993960.pdfIn PDF document text
    • https://polandpools.com/contents/files/56977407776.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132cf4ced918---83713866822.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/21131651724.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/boxerepa.pdfIn PDF document text
    • https://noddy.nu/images/file/9666670950.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/8973814380.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/metudijuvizipepelusoj.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/sezaziwenom.pdfIn PDF document text
    • https://network-italia.com/file/xotuvuban.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/21793880543.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/tezeg.pdfIn PDF document text
    • https://rm-parketi.si/uploads/nerumifilixivurepereno.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/48488351601.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/92200606013.pdfIn PDF document text
    • http://lj-group.cn/upload/files/36799162397.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/hnv9hhai8468lbjg8j1nhmtchn/95790456023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=final+fantasy+6+androidPDF link annotation
    • 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_off000108a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A0 10472 bytes
SHA-256: 5c295e621acddccfad16a1fe612e0d41b4f13348961508079057625d73c32b2f

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