Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9431a753bf091e…

MALICIOUS

PDF

75.8 KB Created: 2021-04-11 08:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1153b4e7c685b24c2dbe743b238f6be8 SHA-1: 915ca0d152d20a2c6e7718d553cfef23d79455e4 SHA-256: 3e9431a753bf091ec4a6e1499ff2fa89f3a7e6a6b37d9365439b5a643b7f1c01
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, with a critical ClamAV detection of 'Pdf.Phishing.Trojan'. It contains an embedded URI pointing to a suspicious domain, 'jottigo.ru', which is likely used to serve a malicious payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to a book title, further supporting a phishing or social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=divina+commedia+purgatorio+con+parafrasi+pdf PDF link annotation
    • http://wdd13.ru/best_books_to_learn_austrian_economicsy6zdu.pdfIn PDF document text
    • http://tuimag.ru/java_8_collections_tutorialmvfon.pdfIn PDF document text
    • http://5-euro.info/gutowirawoz2blf.pdfIn PDF document text
    • http://businesshelpservice.com/blueprints_family_medicine_5th_editionfjnet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469641/normal_6016a518a8dff.pdfIn PDF document text
    • http://xsale.trade/vasopamuzawupubirijhj8yh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450896/normal_5fddab451c345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487662/normal_6021503a2b321.pdfIn PDF document text
    • http://golivexi.22web.org/travel_systems_compatible_with_britax_car_seat.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/mipeboro/29236439901.pdfIn PDF document text
    • http://mokotodul.epizy.com/oxford_handbook_cardiology.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/19245078612.pdfIn PDF document text
    • http://wejifofodig.rf.gd/nojujixobilemamir.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/87834803390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75924999-5af7-4cbe-857f-e75c85ea2a0a/68032879213.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/beautiful_powerpoint_presentation_templates_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66b49bb7-7585-4c09-902c-5a117fbdff77/the_trials_of_apollo_book_3_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/new_punjabi_boliyan_song.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/58903277673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d70315f9-bbaa-4c2d-8c6c-e278b6738fb3/pamebivow.pdfIn PDF document text
    • http://suzaxefewisuvek.rf.gd/new_english_words_with_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4451a1e4-fe6c-4f87-aa49-8dbe36d8c4a8/zewazipuvixiferanav.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_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 5504 bytes
SHA-256: 0503916e9b87f5ea48a09af8ad5c53896346b69bc7ab951e9fdf30e9eee759ce
font_01_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 11764 bytes
SHA-256: e66f875167523ad2a6b1d6d0e4d515aa2fd6b1d97c329903f956d70d9cf6aeec

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