Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4809b6ad73fdfb…

MALICIOUS

PDF

91.5 KB Created: 2021-10-29 01:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d83176baac1152540f240e3d164769fe SHA-1: b2294b16b5e39ee617a14a3f83c2a6e3e0ff9375 SHA-256: 1c4809b6ad73fdfbaf2b3a16259be6fe28e9c078ea9d5f9bdd9b2628333e2e00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://aktifimmo.lu/userfiles/files/64333122823.pdf In PDF document text
    • http://francescasciortino.it/userfiles/files/82793565920.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/39833661148.pdfIn PDF document text
    • https://5974293.pasarantogel.com/contents/files/62120528784.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/robal.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/75736692964.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/xotekur.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/18038923569.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/nodote.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210905005539.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/jijosugesowozefazile.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/rogurorimudosubikupojave.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/92413145727.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/34159380887.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/xikuvus.pdfIn PDF document text
    • https://rosycaffe.com/file/detugikimevozebejax.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/zezotusegulusatunodul.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/19066085960.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/31362756895.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8890ea4e1d16d8b37a1a0929b3f0d86b/55690027467.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/32157093890.pdfIn PDF document text
    • http://riviera.az/userfiles/file/rumagiz.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/74152687546.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/88042386003.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/21412077100.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/fepilavotawufaxefojejovan.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/65310090006.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/7xhmvLXWVJc/uplcv?utm_term=theories+of+personality+psychology+pdfPDF 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_off000100dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DD 17640 bytes
SHA-256: e44510e14d5f72206df8e28868f1fba2405ad713cd447354a1ba3e4e93cfcdd0
font_01_sfnt_off00012ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D8 10976 bytes
SHA-256: 759a314a1830de49e5b9ed2b75d9e35ed64ba395834dcc1b66b9b8af07205041