Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb022a3a7afbe33…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 00:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 068ab3f76a9b7485d4860a7e87a69245 SHA-1: e47b8ed254e62b3912c09b536812bf33545642cc SHA-256: aeb022a3a7afbe3330c6848b4c722df578b717375b193a446f7ebd608eec44a8
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by an ML classifier as malicious. It contains numerous links to external PDFs hosted on disposable domains, suggesting a link farm designed to obscure the true malicious intent. The presence of multiple PDF URIs and a disposable link farm heuristic indicates a likely attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 4

  • 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 https://dentalrud.com/userfiles/file/pobanukenovaker.pdf In PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78957e2d3---xifamabox.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/56539086852.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/jejutejuzosem.pdfIn PDF document text
    • http://all-premium.com/user_file/files/66131620816.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/3159269783.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/61629852557.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/28810743516.pdfIn PDF document text
    • https://bselink.com/userfiles/file/9963504408.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/kebanalazosab.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/83459129832.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/dovowitetimugesuwetis.pdfIn PDF document text
    • http://roocenter.ru/upload/file/12348553336.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/vopexunezax.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/zetowomegazuwid.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/24132152201.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/68728699859.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/damezejoverekok.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/nopefuwunemagovuvurix.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/28908825545.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/labunobekuv.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ab383025---dabidi.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/59353288575.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/barirumajirami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+stadium+2+zip+file+downloadPDF 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_off0000be7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7A 17652 bytes
SHA-256: c2a5b9af08636e5fa9cdcbe2fa3a9f54d99d05c072a6da79c633b25a5479ba25
font_01_sfnt_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001049d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 11020 bytes
SHA-256: acb21060bbd3efdeacae26ce22c4c5271de171d015275baa713786101139f0e7

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