Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5de8243ebb51625…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 19:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f413adaae7588a15169f9585e6c7837c SHA-1: 6740b7684f20eae85a6a596ad6ce5283d058b421 SHA-256: b5de8243ebb5162527ae4ae7bacb28db09ea01ce9d7cfbd757c4a7cb57be89cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

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://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/fuwabedi.pdf In PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/rajagexomeju.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/tazanomejofonoli.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109030137448272.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/buwonunafexuz.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/61412107253.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/34012514575.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/12471503419.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/53249299301.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/71504869335.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/99657118233.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fugetofefoto.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/58114374619.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/14969400572.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/lesawigoselijapibepafala.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/jukajofoxezivarovifo.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/17946320121.pdfIn PDF document text
    • http://strap.sk/uploads/files/43696610251.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/35676837973.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/24640827283.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137acca346c0---4368705656.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/15164794763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=song+of+solomon+pdf+toni+morrisonPDF 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_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 10620 bytes
SHA-256: 5220b85459cee03b3e49baa77d01179717a6220c15b323aa75d0f2f4c51f0d88
font_02_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 18004 bytes
SHA-256: 1e286ea9364eb680a57b516867226ce8f1232b74c56bd66baf0d4f83a935f1cb

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