Malicious PDF — malware analysis report

Static analysis result for SHA-256 c568b35961dce896…

MALICIOUS

PDF

70.4 KB Created: 2021-02-14 17:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 28c202ce5589f0e7577019a664181cbf SHA-1: 19c13aff1240171aaa23f77975e645e9a6d018ed SHA-256: c568b35961dce8965757d8d62fe1bceaf775edf43dfe002fc255ba444b1ca36d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://leonvi.ru/wb?keyword=o-%20e%20sound%20worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380405/normal_5fdbcaec7cdf9.pdfIn PDF document text
    • https://gumijunu.weebly.com/uploads/1/3/5/3/135399233/fiponubex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443802/normal_600c357c7e77a.pdfIn PDF document text
    • http://trokot-shopnew.online/20593870966w97mi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_6025c387bb342.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478687/normal_5ff56effa00b2.pdfIn PDF document text
    • http://vashmaster.info/periodic_boundary_conditionsfc4mu.pdfIn PDF document text
    • http://vpntop.info/gangstar_rio_city_mod_apk_obbihokv.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/pesevifugegajuwi.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/dejolavubukugeb/monday_punday_294_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/varizazogesuvuzidefosunuv.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/57661706654.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/ambarsariya_pani_song_free.pdfIn PDF document text
    • http://povuputuk.epizy.com/bgp_configuration_step_by_step.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/facebook_video_mp4_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/lawdepot_invoice_template.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/arteriovenous_malformation_in_the_uterus.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_off0000d63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63A 4884 bytes
SHA-256: 9dfa347fb859fc99dc8dccb40ee1f94bb7c46a6593c8e2d41c375d40e6996050
font_01_sfnt_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 11196 bytes
SHA-256: 600d4971439c2d01d93cb682f407d062e8e7b62774a412c767020b2c86362228

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