Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af2f79267519beb…

MALICIOUS

PDF

64.0 KB Created: 2021-09-14 07:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a71ec779bc297ca9e40e744f5c3da968 SHA-1: d38c67045ae9db49925124e6060530e456611295 SHA-256: 2af2f79267519beb9996e043226422809b863e2bc3cc2bf096692702e1e82668
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of link farms used to distribute malware or host phishing content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, suggesting the PDF's primary purpose is to redirect users through these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7155

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://pistant.ru/uplcv?utm_term=ram+cleanup+apk PDF link annotation
    • http://chonburi33.com/userfiles/file/37198243505.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109080416588184.pdfIn PDF document text
    • http://blgjad.com/upload/files/58072613991.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/73264973476.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/ranominagawamojadufuz.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/55590755604.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/detanugogofepipunimof.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/99417437548.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/67181282301.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/vujemarabu.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/41366727163.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/72920576009.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6143eb45a37e0ad59ec72203ca0f629b/20794951988.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/tamurupiv.pdfIn PDF document text
    • http://humanlitech.com/files/files/gijaxodemujimomeder.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/tejawujokozujeladusuxukux.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/47474319554.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/tetatimugifolakuvuzuzodi.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/podarulojeb.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/36236959858.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/vexirudifizogixitosupepi.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/zurokepovexivinexo.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/46437252021.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_off0000cd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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