Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b01175edda3fed…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 06:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dbde899164d6c9d4850f348e03b29c9f SHA-1: ea593f69ed08ee8ec317a62df7f64b0030e318ad SHA-256: 37b01175edda3fed8573b034d77ecf75b2e2199ea634df7c20341aaf4660f369
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to potentially compromised websites, suggesting a phishing or scam lure. The PDF structure itself is also flagged as a link farm on disposable hosting, further supporting its role in redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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 https://cambodiadriverservice.com/userfiles/file/2885906856.pdf In PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/442a256cb5e52d7ca379ce60ee3190dd/42587170375.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614411fb62d65---43821219623.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/18535065540.pdfIn PDF document text
    • http://carbonelite.ru/file/87595179508.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/gimidupuzurilogozenagebo.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/jerugeduxabimuwavilos.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/21983267978.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/fikuxiraxu.pdfIn PDF document text
    • http://learningkey.org/userfiles/zabesumitawik.pdfIn PDF document text
    • http://secretinvitation.net/images/files/53883095030.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/87136361893.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/99023357346.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/xosizugonuvisili.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/4429376310.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/mamefomuvig.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/98639017517.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/wexixadepanesaw.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/disuxubizumukuzavoxuvu.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/19229101819.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/tinevugewi.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210904060950.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/63978655758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+on+screen+keyboard+for+androidPDF 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_off0000cbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 17336 bytes
SHA-256: 01ce7ab910c87462c7b7e3e44e2b33f8710534b68fe14a44977fe1f9cf2a7a0a
font_02_sfnt_off000110fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FE 10820 bytes
SHA-256: 59e41d32fcab0fd577a9f67a1278f77f8a105e7fbb4e161b5cf1b780a309f4ca