Malicious PDF — malware analysis report

Static analysis result for SHA-256 58baf3f471506e2e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-10 15:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 038d4cb171e1f744d26ba25d0fa6f8ff SHA-1: 8d0283d8eabf5a8823d8601428db462130edba87 SHA-256: 58baf3f471506e2e08bc3e052140e896859093d1a6460666f082c5997f00f2fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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
  • 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 http://carrozzeriabosini.net/userfiles/files/nezevunukepevifu.pdf In PDF document text
    • http://scard.vn/app/webroot/uploads/files/zikegenonumixax.pdfIn PDF document text
    • http://timebymtm.com/upload/files/12548922836.pdfIn PDF document text
    • http://sdds.be/userfiles/file/dojatenabekuwanedize.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/vikuliwe.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/panavumunu.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/gugokifonasogixa.pdfIn PDF document text
    • http://kd-council.com/upfile/files/duditudewuvusexego.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/vetoreroluliwizajaget.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/56668888612.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/xiwawikidevuzo.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/92682285823.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-3/20210903142606386920.pdfIn PDF document text
    • http://ore-processing.ru/d/files/69469351995.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/sunesatutilazemagisedaz.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/29208690642.pdfIn PDF document text
    • http://abnicum.com/files/file/55964008076.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/15834241677.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/kemojowaxe.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/65971516774.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17084471773.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139680179b7d---regegoveniwowoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+increase+font+size+keyboard+in+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_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 10904 bytes
SHA-256: 00f8e89fbb430045c1bbc039328c0e0847fdfd06a4ce02492feab57e70c3eb3e
font_01_sfnt_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 17112 bytes
SHA-256: ea4bb568c983eaadece5c9537769bebcd73204c190cd099cca5563c704e21850
font_02_sfnt_off000119d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1