Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3c0aabc8c35b6e…

MALICIOUS

PDF

54.5 KB Created: 2021-10-11 04:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 970e6e1933605968eec2dd45ce5e7a8f SHA-1: dfa0e843aa9a8111a9b8c422e1eab2241b892218 SHA-256: 8c3c0aabc8c35b6ef0d1b5796a380eab492d733adc16692cb072857f56e0dc3a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8059

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://helices-evra.com/userfiles/file/bojigilo.pdf In PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/4500043084.pdfIn PDF document text
    • http://mobilenmr.com/files/files/10369133747.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/tafufoxutu.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/95065418815.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109021833039738.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/fezulelivoku.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/64216318505.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/48694868243.pdfIn PDF document text
    • http://synergyproperty.com/images/files/zurojivugukumuze.pdfIn PDF document text
    • http://pedraferro.com/files/files/94520543989.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/mukedonifavexezererakut.pdfIn PDF document text
    • https://evabizz.com/userfiles/file/75814075183.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/mexapazowogivazozemuxev.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/46065189968.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/21338463029.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/66058600665.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/85117791315.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/kunozij.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/fepomopubim.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/wexivumuxunuzabo.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/vegux.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615e5d341f073---56451174185.pdfIn PDF document text
    • https://bfull.ru/uploads/files/43805187415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=factors+affecting+the+growth+of+small+and+medium+enterprises+pdfPDF 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_off0000b970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB970 11228 bytes
SHA-256: e242bc0cdbc178402117e7a4e1e87aad184acb1af8c9f3d4ee789e9006189e3c

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