Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ade049d85b929a…

MALICIOUS

PDF

81.3 KB Created: 2021-03-27 10:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a2b1d3c12e4c9b906fe252a78a6b1ae0 SHA-1: 21520299b482b88c71bd056efd93f9859e55751f SHA-256: d4ade049d85b929af529d7ec20419e81241bd22ee943744ad02cad9efed08646
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links, with a primary URL pointing to a site that appears to be involved in SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded links. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful websites.

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.
  • 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.
  • 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://soxebez.ru/award?keyword=definition+of+motivation+pdf+file PDF link annotation
    • http://jeseselanus.scienceontheweb.net/what_are_values_and_beliefs.pdfIn PDF document text
    • http://diluzadumavotux.getenjoyment.net/english_literature_and_composition_section_1_answers_2014.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/peter_principle_definition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5595b2ab-681d-4a42-9172-9125acf75322/36896643441.pdfIn PDF document text
    • http://jorowubibe.epizy.com/school_administration_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/granny_mod_menu_apk_v7._2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f39e708-d2f7-4346-be28-cf380fe32a57/kokidegexideruf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aad4a6b-456b-4017-9cab-6409ac560ec0/dagubomajakituzo.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/toronto_alexithymia_scale_tas-_20_questionnaire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7fe01c-a87c-437a-b22d-cf5f7450c108/62560626041.pdfIn PDF document text
    • http://nakedaxosa.rf.gd/impressionist_and_expressionist_art.pdfIn PDF document text
    • https://921790ca-7b53-43bd-a25d-275d6f056404.filesusr.com/ugd/9d24cb_b8ca0a1205924d109b7ab043d30c5ac1.pdf?index=trueIn PDF document text
    • http://raxajabidadida.onlinewebshop.net/alto_sax_songs.pdfIn PDF document text
    • https://e8802323-0824-40c5-8a58-19d700e27586.filesusr.com/ugd/50cafd_4be220cdea6649ccb8784a5730d3b5a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4737d0-c88b-4414-bd29-b5714515dc6e/75563528014.pdfIn PDF document text
    • http://jitoritobo.epizy.com/vapagiramopuru.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/pirowofaxizifod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03a1edc-4870-44eb-ba96-8009ccd6fd82/singapore_math_textbook_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/56248720984.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_off0000fe40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 4972 bytes
SHA-256: 2e2fc4e320a5bbb8c2cb86afa42660ac8261c7a93983b43edf60ae6566511bdb
font_01_sfnt_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 11588 bytes
SHA-256: 2505769561c015051449925801e942a68546aa796116b9eebca0b64d3a4d82c1

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