Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e456a1ea15959e…

MALICIOUS

PDF

72.8 KB Created: 2021-09-11 06:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78cc8bef4d7e5dcc08cf7feb10fc6b3d SHA-1: ea157a22bc2cb04870bd895c50aa392ba5526c63 SHA-256: f5e456a1ea15959ee58899cfec470d453fa7aa85040edaeb9f52d326a0527ff7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of unique, potentially malicious links within the document, suggesting an attempt to distribute malware or conduct phishing. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/98713704593.pdf In PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/dupoxelo.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/gutofedoxulugawoleg.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/tusovalexekudisokefex.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/64364766186.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/47405441597.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/179433651.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/gemajifadadusitufigede.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/38447141647.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/92265273835.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/nesanowokodonodirilalebi.pdfIn PDF document text
    • https://khanikango.in/file/69484165847.pdfIn PDF document text
    • http://humanlitech.com/files/files/papukuwes.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/91819980285.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/vowazudirikimoxopi.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5274a846e9c93e1f85e2d4ecdc60257a/linilamenobojaf.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/15875033348.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/fusirufizutodop.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/gatepafakubisonajut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+longman+anthology+of+world+literature+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_off0000b9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A6 16544 bytes
SHA-256: 650ea9d9b6f4a3cf22a29dd4412fe86a13dc8ccdd1ff72e5fa5b6ff1f27d466b
font_01_sfnt_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 11040 bytes
SHA-256: c65a8c82cc6d7aeea9133f200571ee7eb7bcb1deb95b88399216d39c6d9c5bda

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