Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fa4c8ec4986619…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 22:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 55d42265d1fdb987d5133111410b4632 SHA-1: 0d3081dcc9f5297f39507dbe2e48938d32f03370 SHA-256: a9fa4c8ec4986619bdd9ede3b9ec9d8742eeb72fa454140ed95d38f7c413b122
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kleinschaden-expert.com/userfiles/file/debij.pdf In PDF document text
    • http://levant-tekstil.com/other_files/File/69246056768.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/74449493182.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/162549434.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/49958524660.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/86483726160.pdfIn PDF document text
    • https://renewone.de/files/27881770766.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/44649859186.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/xurotejavigefofipimeru.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/1672777084.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/29992613889.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/93782453854.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/70012863410.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/devamadigasitu.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/fekezogiwetizugik.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/gotibo.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/36846072944.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1be4bcd2253695e7e5c3ae024946f6cf/24444553686.pdfIn PDF document text
    • http://e-hematologica.com/users/file/xomevasog.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/liluwanefufafepokolu.pdfIn PDF document text
    • https://felicityokolo.com/file/dapazexenepusiriporipam.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/daneserumefalabapevanatov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=microsoft+powerpoint+presentation+apkPDF 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_off0000db42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 18128 bytes
SHA-256: 6575644da29b26f9ebe7946ec1cdd2e1ef8713c143a841d35e19a48c9735b650
font_02_sfnt_off000121c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C8 10600 bytes
SHA-256: b9d6cf0b469b8ac5a1f228baa171869365b9f8c4fb81953b6ec243416009b9fa

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