Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4c1de29c95d510…

MALICIOUS

PDF

73.3 KB Created: 2021-03-02 19:07:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 4bc4adf55dfd5d76bad701b4330eb7b4 SHA-1: 0ced29acf20b804d940e689e7086233307989035 SHA-256: 5b4c1de29c95d5105af9010b2a20dc18d8a582643df5eef960ab000ea0834a71
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=how+to+read+a+book+adler+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489992/normal_60152adc78b1d.pdfIn PDF document text
    • http://putoseba.iblogger.org/6717683291.pdfIn PDF document text
    • http://zofukilevomori.iblogger.org/panasonic_rice_cooker_parts_hong_kong.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426059/normal_5ff5f77013832.pdfIn PDF document text
    • https://tupeduwexawagov.weebly.com/uploads/1/3/1/6/131607208/nosuti_kubelew.pdfIn PDF document text
    • https://xutepokukofegik.weebly.com/uploads/1/3/5/3/135391302/vufuxanotiw-ramejoji-bifupodarewos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_603d7ce3bd6d5.pdfIn PDF document text
    • https://cdn.sqhk.co/vosiwuli/Y25heyM/pugosezejivawoxekogom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492246/normal_600e6bf2ce66e.pdfIn PDF document text
    • https://jitedamanun.weebly.com/uploads/1/3/4/6/134627504/1322333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406782/normal_600f0cae9bda8.pdfIn PDF document text
    • https://cdn.sqhk.co/munemuzabuk/gijiTgi/28606972500.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/nowokil/free_english_worksheets_for_14_year_olds.pdfIn PDF document text
    • http://jepisaf.epizy.com/pafekusuzodaziwupodotobe.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/nums_admission_form_2019_mbbs.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/worksheets_of_relative_pronouns.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/local_guide_level_10_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/pc_app_store_uc_browser.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_off0000e51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 4896 bytes
SHA-256: 192c8fdb4d2ac02ada5890bbc89de10383ca8e3668739cc8d432922b25d970da
font_01_sfnt_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 10024 bytes
SHA-256: 868394f4f2e98a46878f8e74c1b5719be65d3a76609e3e11c8c6a06e8b79fec8