Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff02bdde6ec932ea…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 19:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c13b808a55bc2f212edeaf5a4512526 SHA-1: e0a16fdca9df3fbfe7baa648100a3c98b211bcad SHA-256: ff02bdde6ec932ea370538e287d3ee5a7bd5efd0ef62b7515b9d5452b14d55fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the link farm heuristic indicate a phishing or social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://chcial.ru/uplcv?utm_term=download+iso+windows+10+64+bit+pro PDF link annotation
    • http://konferencii.org/web/uploads/assets/file/jonifodizirarelozu.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/88826333835.pdfIn PDF document text
    • http://keramann.ru/uploads/files/23341129859.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/24009403612.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/20215146032.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/savolunetutej.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/85037680.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/19121922626.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/80527960559.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/vadqnqbhubv6ki15ok555etng4/wugujo.pdfIn PDF document text
    • http://osayit.com/images/file/taritopozodafawafu.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/kubumevedadinuwugilozid.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/56229396586.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/30981995926.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/48876306837.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f681acc9de---mejidatobepaweparamo.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/nikefawuwebikufifarigok.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/46438710294.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/62731809088.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/widobexejanakodufovamelo.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/8409003498.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/gowunurasevigupidebixo.pdfIn PDF document text
    • 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_off0000cdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EA 10900 bytes
SHA-256: 89ea89b33e3914cd4facb5fdfc69d063ef177447dfdf3de24583a141c42a3813
font_02_sfnt_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 19208 bytes
SHA-256: 582f147f3fa537cfba18c2ecf6493ef5fe86f834e17b5337f687f7efce73ab0e

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