Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a1f603555f767a…

MALICIOUS

PDF

69.9 KB Created: 2021-09-19 18:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06f4f890c62911540c748cbea730131a SHA-1: 91fb7d3714591086b530d725787ac7d86a7cd409 SHA-256: d5a1f603555f767ad6cf805aab2e975f51430f22e20ab97695addfb6b414ebfa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It functions as a link farm, directing users to numerous external URLs, one of which is `https://synerhu.ru/uplcv?utm_term=plant+vs+zombie+apk+full`. The presence of external URIs and its classification as a link farm suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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 https://synerhu.ru/uplcv?utm_term=plant+vs+zombie+apk+full PDF link annotation
    • http://planetamama.ru/files/file/99872918277.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/pofefulupoduzobogaxas.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f17acee8a1---gazakedumevonazaxafibo.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/sipibuzixojorewukasuzozuw.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/fawapepavetigovefapubane.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/vazejoxikovabafajogunil.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/sogesomoxijanudoro.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/ludaxo.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/82024741659.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/kawazisuzuda.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/gitofeteju.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/59034700303.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/pinowinasefizetap.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/janomazipo.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/xuzidogozus.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b820e91283ca969504bd7451a1189b0/zopavekabazaziwul.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/86882491916.pdfIn PDF document text
    • https://pecsikult.hu/files/file/pavopizavenofaxo.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/18129878623.pdfIn PDF document text
    • https://strechybenesov.cz/content/50820009504.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/daxigunex.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/dunofikudir.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210908123828.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_off0000b1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E0 15536 bytes
SHA-256: 8b3038d94110517a742271e0f7a52000b5dd3fdda188ceb75a32f75ff6c1146e
font_01_sfnt_off0000d97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 10876 bytes
SHA-256: a1b499010165401411181c7d40ac43a8743aa0c2e874921830769991243821c1

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