Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa135dca26d3e88c…

MALICIOUS

PDF

97.4 KB Created: 2021-09-23 14:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 64c0a1ad3b29c6c9612c5516fefc1fc1 SHA-1: be20a737e5addb7e44f21eaeb96608c21040b1dc SHA-256: aa135dca26d3e88c0992d985bda77a516efea48eaa58062f75a84b504dbf29d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://a-kamen.com/userfiles/file/gowokuxabovujupi.pdf In PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58938278115.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/wobugezef.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/14925727266.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161443a8fe066d---fugiwefanamup.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/koterexeleni.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144424266d3d---55885751927.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/wasuwawubose.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/9435330603.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/11125333488.pdfIn PDF document text
    • http://state-lithium.com/upload/files/53564315536.pdfIn PDF document text
    • https://best-label.com/upload/files/xufepanetefesinabopaw.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/25669450083.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/13514131977.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/gulanul.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/goritugix.pdfIn PDF document text
    • https://unosms.us/userfiles/file/94617594160.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/76488353781.pdfIn PDF document text
    • https://irrisyst.eu/files/file/53039113496.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/77615518447.pdfIn PDF document text
    • https://themalc.org/files/file/92760512368.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/55417611232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bronfenbrenner+the+ecology+of+human+developmentPDF 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_off0001143f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143F 19008 bytes
SHA-256: 47260edd280669c835d3cef493ccb82f903c1448ebdf9159aad773c29722bc98
font_01_sfnt_off00014594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DAB 11280 bytes
SHA-256: 4417c7b6ba81fa6274c12566cebc7b0097c89b5e3efaae9aa16e12f4fd30bd3c

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