Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9998be82fd06355…

MALICIOUS

PDF

71.7 KB Created: 2021-02-10 02:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 838f19179d0341c98c1e794a38eb9f49 SHA-1: 42da816cba663058280c02c9ff8b6f03902087ae SHA-256: f9998be82fd063553b349162ad3f1f5f7cf2375b26555fa588e9bc96b98dad6c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure itself facilitates the attack by hosting numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=crescent+valley+high+school+visalia+ca PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448743/normal_60112782612f6.pdfIn PDF document text
    • https://xuzopodoker.weebly.com/uploads/1/3/0/7/130738955/kuwena.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426262/normal_60093997b7ba7.pdfIn PDF document text
    • https://devopududifuwet.weebly.com/uploads/1/3/2/6/132696325/16957f92e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475847/normal_6005865dd6d1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481509/normal_5ffb961724f0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447253/normal_60012ebebe3b4.pdfIn PDF document text
    • http://xawinewilapirog.iblogger.org/81015423231.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414691/normal_5fff3e6317f88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://runopokasuvi.epizy.com/invoice_example_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/google_sheets_ipad_fill_down.pdfIn PDF document text
    • http://texegap.epizy.com/leon_county_booking_report_july_28_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/math_questions_for_5th_graders_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/vibulezogud.pdfIn PDF document text
    • http://pifutujotot.epizy.com/67952479980.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/ipl_2019_match_schedule_time_table.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/avast_free_uninstall.pdfIn PDF document text
    • http://nowivopikuzud.epizy.com/poe_arc_witch_guide.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_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 5128 bytes
SHA-256: b7320184ba52ca194c99f537021e5887945738661047eaf4ce979c2ad1542eee
font_01_sfnt_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 11568 bytes
SHA-256: 08d9a1d47afc109d566f4f05baaf56e402d52ff9033dd4b688984ffc4699caca

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