Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51d5fdd2c9199e2…

MALICIOUS

PDF

109.4 KB Created: 2021-02-09 06:28:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 76721567be6a44b55beeb1c1a0d630f0 SHA-1: 413e147d34a5187b03f4af1ae9caf6ec2a617ca9 SHA-256: e51d5fdd2c9199e2ba660d49d955f8ce3a364a6ce6fd07263165a00c60af3c0c
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://jacksth.ru/aws?utm_term=buffalo+breeds+in+india+pdf PDF link annotation
    • https://tebeneka.weebly.com/uploads/1/3/0/8/130874559/e47a5.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/majixekusez.pdfIn PDF document text
    • https://bewulikafujisew.weebly.com/uploads/1/3/5/3/135326730/a88f08fe3cb.pdfIn PDF document text
    • http://rankingcoach-seo.com/tipos_de_actos_amoralespatdb.pdfIn PDF document text
    • http://zahlungsservice-ch.site/guvexoradt34gc.pdfIn PDF document text
    • https://simebusuf.weebly.com/uploads/1/3/1/4/131406507/bobatorojatole_mekafo_bonokag_ferusenimodibi.pdfIn PDF document text
    • http://adyga.site/vululuwasupipizewiwufagojmin6z.pdfIn PDF document text
    • https://wadaxoleda.weebly.com/uploads/1/3/5/3/135311928/6663280.pdfIn PDF document text
    • http://sarkife.site/romudetobalupetopuzaxigauas0t.pdfIn PDF document text
    • https://cdn.sqhk.co/pubisifibuj/Bid4ohh/bukobeni.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/pukiza/aflac_cancer_policy_information.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/iphigenia_2._0.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/pokavuk.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/love_island_season_2_mean_tweets_answers.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000171a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x171A5 29988 bytes
SHA-256: f5002b94f1898a17f03361509f22fab1c6508b3ce4de755a97e76b541bb40c71
font_00_sfnt_off000137bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BC 5224 bytes
SHA-256: 09025af4ffa073a9c53da21fec174788375a34a7d9643a29c6de88c5f49d40fa
font_01_sfnt_off00014988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14988 12504 bytes
SHA-256: ef6146a7aa57f7c53608785139fbbcae47f5a8ca3c6e18d68e0509b6708dfd15

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