Malicious PDF — malware analysis report

Static analysis result for SHA-256 a483c461fd0151aa…

MALICIOUS

PDF

86.8 KB Created: 2021-03-12 11:07:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d1f78d712939ba72fe0974fc5db282e0 SHA-1: 541f899c857db292060a5f7bbdf89b089086b694 SHA-256: a483c461fd0151aa93995c9a9c539c0e87c5091bf469966f5e7a6eaeb70cd1bb
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://baarspo.ru/123?utm_term=angular+6+admin+template+free++github PDF link annotation
    • http://silewugebed.scienceontheweb.net/basic_english_book.pdfIn PDF document text
    • http://wasegulom.mygamesonline.org/3ds_max_tutorial_download.pdfIn PDF document text
    • http://dedaruk.scienceontheweb.net/gigatowovimonipefowije.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/scientific_method_project_ideas_for_7th_graders.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/kolamitefe.pdfIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_40bdc790e77d46dda5d505f82797c7d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/concepto_de_cadena_alimenticia.pdfIn PDF document text
    • http://zevesijuduma.atwebpages.com/49184170442.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/sipux.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/video_er_iphone_7.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/82650382530.pdfIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_4d1b5cc63f1646cc8fa011c03aec11ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/vuxaxivanu.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/gilanifemejodasijisivi.pdfIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_584d09169b29491aad2509b5c6b0bb90.pdf?index=trueIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_59d0c5066e844d53bef00b275495f36c.pdf?index=trueIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_3e794e38b5d247a9a0cc684f5157c798.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovezux/46741072057.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/rizeliza.pdfIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_86d9f2e45e56407baf03fcfd8ef857bd.pdf?index=trueIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/advanced_excel_tutorial_2016.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11626 5560 bytes
SHA-256: fc83eedc8245ef275dbc318b1f47c34cfbdcf0e9e1fd2ff0fc21f9afe75e0989
font_01_sfnt_off000128e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E5 10948 bytes
SHA-256: 18ebe0b902d0fed4c311643adaba9b415015221283ac2df359162d7489e31598

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