Malicious PDF — malware analysis report

Static analysis result for SHA-256 977a29438c3a7f15…

MALICIOUS

PDF

75.8 KB Created: 2021-03-27 16:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b46195200fd3bd40d4973b1f1f70c350 SHA-1: 536f7fad75932d3d023ca740820dd89950e5d795 SHA-256: 977a29438c3a7f151b35d0de4c7af9265a08d9e7b2418f6e38928469dbe585e6
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with one prominent link pointing to 'https://jacksth.ru/123?utm_term=calculus+3+book+pdf', suggesting a link farm or redirection to malicious content. The document body, though heavily obfuscated, contains references to 'calculus 3 book pdf' and the authoring application 'wkhtmltopdf', likely as part of a lure to disguise its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://jacksth.ru/123?utm_term=calculus+3+book+pdf PDF link annotation
    • https://luzenesezenobo.weebly.com/uploads/1/3/5/3/135307250/zixitameje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_60149339013ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384463/normal_60484f51ce5df.pdfIn PDF document text
    • https://zexiditituluw.weebly.com/uploads/1/3/4/7/134734655/baroxi_sovududes.pdfIn PDF document text
    • http://lixuzixewufixib.66ghz.com/acrobat_free_for_windows_8._1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_602c9e630ec69.pdfIn PDF document text
    • https://watogovujun.weebly.com/uploads/1/3/4/6/134626060/lajajaga.pdfIn PDF document text
    • https://vizefibamoraxob.weebly.com/uploads/1/3/4/6/134613498/jemaxiz.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/jasadavebaga/lucknow_university_admission_form_2019_ug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b85158a-edb3-4306-a5ed-419b7da9dd01/mumakiwiwirufolikexexitob.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/10466975109.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/akkadammai_ikkadabbai_audio_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ed6d7e-0d4c-45b6-9a7c-28d7b5501ec1/suwima.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/titozotimisewagugafa.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/introduction_to_bioorganic_chemistry_and_chemical_biology_solutions_chapter_1.pdfIn PDF document text
    • http://pudawetik.rf.gd/xuzagutevusaravel.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/65919779962.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/whatsapp_messenger_java_app.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/72183873398.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/catholic_daily_bible_readings.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_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 5324 bytes
SHA-256: ee5d8e30465c02948c7c2f2960dac8297194dac56fdd42ccab38052659374ace
font_01_sfnt_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 12024 bytes
SHA-256: 7b4511e922bc12b5b11459c92e72194db08d757d9cf5242f78cf7caf711c1a3e

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