Malicious PDF — malware analysis report

Static analysis result for SHA-256 be125b7ed8045705…

MALICIOUS

PDF

75.4 KB Created: 2021-02-15 09:19:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 12a8773949858ee13365b07ce1fc520b SHA-1: 14988aadf0c133ced431499db2e96428e766ad47 SHA-256: be125b7ed80457057d8c314154f834fa87afb590743a0e42c21251ad2296a19c
136 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it uses an image lure to redirect users to a phishing site. The embedded URL `https://jottigo.ru/aws?utm_term=javascript+date+format+dd-+mmm-+yyyy` is a key indicator of this phishing attempt. The document body, though heavily obfuscated, contains references to JavaScript and date formatting, suggesting potential client-side scripting for the redirection or further payload delivery.

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
  • 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://jottigo.ru/aws?utm_term=javascript+date+format+dd-+mmm-+yyyy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417643/normal_601146b578ff3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374857/normal_5ffaa62ed367c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412778/normal_5fff43b8d72fd.pdfIn PDF document text
    • http://clubstore.info/75490174783un9tr.pdfIn PDF document text
    • http://mrt-64.ru/nick_robinson_a_teacher_trailerdc3jq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413120/normal_5fe9c70f21d67.pdfIn PDF document text
    • http://salon-fresh1.ru/electrically_conductive_silicone_rubber_sheetdpvq8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426682/normal_5fce9eb32d7e7.pdfIn PDF document text
    • http://mstmail.space/silicone_gel_sheets_for_scars_walmart4b47t.pdfIn PDF document text
    • http://romeital.space/69039798154lknq.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/genijusemu/dufonimofivixupaw.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/20197597384.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/krishna_objective_zoology_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/major_arteries_of_the_body_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/29660150592.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/powerpoint_roadmap_timeline_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/nuxewigutogod.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/bit_torent._com_free_for_windows_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/central_school_paschim_vihar_admission_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/aquatic_ecosystems_worksheet.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_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 5452 bytes
SHA-256: a522b67d5e8f990da2e8665fad613dd09f2e48987f7e490ff41a718e6f9e4bd1
font_01_sfnt_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 11672 bytes
SHA-256: c737212496f30f7024bbd2c9eb816bed79c19262d0833623b675bb21182c91c7