Malicious PDF — malware analysis report

Static analysis result for SHA-256 481b32daecdf6f4f…

MALICIOUS

PDF

102.1 KB Created: 2021-10-11 19:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0fc294c1d9fa8a2bfcfe88a58732fffd SHA-1: 0938c671c3ffa0ecfd8839fae42ef8630b5cde25 SHA-256: 481b32daecdf6f4fab6312f43f281df10e8a81c8e635fe63e46007ef3ed26760
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, 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 a phishing or redirection scheme. The presence of external URIs and a high number of distinct hosts further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://wellgroup.cz/UserFiles/File/89617147166.pdf In PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/39682280482.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/ruwexalulofutokos.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/rimebi.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/23271678119.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210930171004314.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/36220324526.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/zatomepulurorokot.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/wiwazopakujedawagal.pdfIn PDF document text
    • http://yuhuimachinery.com/d/files/davavupupadimilepil.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/76618202773.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/65315645470.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/20315856424.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e72d79c002---lazekejido.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/93550064661.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/88437825696.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/84064975038.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/jixuwerege.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/wasexasifisapakezeze.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/12515680885.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/resuwude.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16150f918d5a02---xabij.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-15/20210915190824310319.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/41991759980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/cmwvf4RlXg4/uplcv?utm_term=what+is+recessive+allelePDF 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_off0001287f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287F 20044 bytes
SHA-256: 9c5d4408fdaf85cb15cc6296565fc109adfd027e144e74d5020ce3ee8362b9fd
font_01_sfnt_off00015be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE8 10160 bytes
SHA-256: d2509d20cbb66fc38b8a1d49b86be14e8f1bb80255cac1645adbe2a4da23232c
font_02_sfnt_off000172ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.