Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56fdeacafaad9c4…

MALICIOUS

PDF

71.7 KB Created: 2021-09-29 08:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 40b40b995048da2507a8f59303eeb873 SHA-1: ee7f3a801bc0696c2330ba9f461c0831f645fd9c SHA-256: e56fdeacafaad9c45faf92ff65bd2bd3dc2e6aa923ed3eca5f10727875308ca8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate the redirection to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://e-cluny.cz/UserFiles/file/54787145110.pdf In PDF document text
    • http://gurolmumcu.com/userfiles/file/fobofugobunesafeno.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/vezotapobivotira.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/53262777456.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/befobivik.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60550842734.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/37013117077.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/wizuridimavo.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__614FA0184B0E1.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ea6b850c9---risenomuzega.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/58868685242.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/26988154674.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/mojepivojuverovaj.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/vatiwufol.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/vedug.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109120848255185.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/runomobupaturepikexor.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/45671960023.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cc773e319---18612283527.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/fuvegiwu.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/82816556316.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/xadukinalowopuj.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/kofetumenaror.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+the+fastest+android+launcherPDF 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_off0000b13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13C 17928 bytes
SHA-256: 7e339bd1eecc2500eca97a25ed1a8065ee76f6813e68d6c3abcde47395c35a88
font_01_sfnt_off0000df12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 10664 bytes
SHA-256: f8f091621fbb3e478563e3c758b59644190e2e669b9ddce65e70538db98986cf

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