Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec89e1e9dc08cbd3…

MALICIOUS

PDF

70.6 KB Created: 2021-02-16 18:49:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 68e34efc0dbf0a0e73d31ed99e870719 SHA-1: ea26e8f1927a6e6a542ecd34db7e96c8add31ea9 SHA-256: ec89e1e9dc08cbd369aca929d29ae1dd8cf17986d37a3f82c72fe62be266357d
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the link farm heuristic suggest the primary goal is to direct users to external, potentially malicious, sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/wix?keyword=morphemic+analysis+activities In PDF document text
    • https://rufuroborotefin.weebly.com/uploads/1/3/1/8/131856068/4abb7da10e130a.pdfIn PDF document text
    • https://faxomozux.weebly.com/uploads/1/3/0/7/130775398/pabineziga.pdfIn PDF document text
    • http://pristav.pro/agile_transformation_coach_ausbildung4goxp.pdfIn PDF document text
    • http://tehnotop.store/pokemon_go_friends_gift_xpr6bz0.pdfIn PDF document text
    • https://xafinuwexedigu.weebly.com/uploads/1/3/1/3/131379324/47e8af06.pdfIn PDF document text
    • http://rrrrkkkkk.space/vozosenakamokozimiu28i4.pdfIn PDF document text
    • http://stavki-na-sport.site/760_horizon_drive_grand_junction_cotzhae.pdfIn PDF document text
    • https://noselarinagebep.weebly.com/uploads/1/3/6/0/136051947/majuxifabipimita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464720/normal_5fd1e6c80d9f6.pdfIn PDF document text
    • http://begetus11ppz.xyz/always_and_forever_lara_jean_epub0ej0s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385202/normal_5fced92c64f76.pdfIn PDF document text
    • http://slamelina.website/merge_racing_modpvadn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474211/normal_5fda2a677f89c.pdfIn PDF document text
    • http://unosital.space/sbpdcl_bill_receiptyasrj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445101/normal_5fcf147d89d8b.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/jivuxo/line_6_ux2_install.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/jurnal_amebiasis.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/66428314884.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_off0000d7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 5340 bytes
SHA-256: 572421919bc052b505d7e7d00a01cbe0cb6d44715f46d1a991b2bcd75fc9d9d1
font_01_sfnt_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 10520 bytes
SHA-256: 946ef30893b6afc32da7a6c5dbadff8804ba57bb21f728ae8878d8721bc40c12

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