Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93488ebb5698e8a…

MALICIOUS

PDF

79.2 KB Created: 2021-03-14 11:28:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e197ea19099b09fae22f2a0bb254c3c9 SHA-1: 6b993bfa1742d262d735e3d16f1f266004edb8b8 SHA-256: f93488ebb5698e8a6345172db57a9e6d649e28ee02f184678d1836f1f6c0acc3
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The document contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs point towards an attempt to redirect users to potentially harmful content, possibly for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=edgenuity+2020+reviews
    • http://ralugugifoxatir.scienceontheweb.net/second_darkness_anniversary_edition.pdf
    • http://mexicotop.xyz/how_to_measure_us_dress_sizecj7a2.pdf
    • http://wepijafiguwenan.mywebcommunity.org/ferufewimopulogo.pdf
    • http://confirmyourverifiedbadge.com/kolman_busby_ross_discrete_mathematical_structures_download55ipd.pdf
    • http://rowexusaje.mypressonline.com/mukosenutibojotuzaxu.pdf
    • http://retamos.mygamesonline.org/books_like_profiles_in_courage.pdf
    • http://pobesegu.scienceontheweb.net/chinese_calligraphy_tutorial.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f621ecf8-e26c-4db3-9bdf-176eeceb312d.filesusr.com/ugd/b3755e_e80bc730508b4cec8b10ae4211a98cd8.pdf?index=true
    • http://wutesejib.onlinewebshop.net/98834574107.pdf
    • https://s3.amazonaws.com/xirixepo/88592689404.pdf
    • http://dakafatuvuguviz.atwebpages.com/89959791513.pdf
    • https://ac25a69f-a984-4293-9c3d-8c9e0f062535.filesusr.com/ugd/cbf077_9e384fcaa1ef4b1d9586d74d74b3f85f.pdf?index=true
    • https://s3.amazonaws.com/xamibudasagas/19219246883.pdf
    • https://s3.amazonaws.com/dikomavomem/88459744425.pdf
    • https://s3.amazonaws.com/fibesezati/emphasis_of_matter_para_in_audit_report.pdf
    • https://s3.amazonaws.com/sedowedi/makosetixi.pdf
    • http://nununad.myartsonline.com/black_and_decker_drip_coffee_maker_with_grinder.pdf
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_9a661f767a284adc9fb05304d3b78bdd.pdf?index=true
    • https://s3.amazonaws.com/xunilukegez/72208220391.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ba.bin
2d3f180c49f103379a8068055361558aafbb79aff568cb3cd6ef3489d1e1549e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 5236 bytes
font_01_sfnt_off000106c1.bin
81a751cd3d01b8668c1457a4742812302aa0cd5ee17bd5920200ba4af0a697bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 11568 bytes

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