Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd167a3979976c3…

MALICIOUS

PDF

70.7 KB Created: 2021-02-15 20:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 77089815a9f77e46cb972cd712afdb66 SHA-1: 88f2ef2f6d3471d12e1df071710cb8d8c6e40d7d SHA-256: bdd167a3979976c340995739e3f0492b8f57ed3c7144b5ab4fccfb684609fade
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

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://bologen.ru/123?utm_term=what+is+just+and+unjust+laws PDF link annotation
    • https://cdn.sqhk.co/pojuwudedi/geu330v/general_knowledge_quizzes_for_students.pdfIn PDF document text
    • http://sixawuragime.iblogger.org/balu_telugu_movie_bgm_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xarepunekifa/xicgcN1/tavunojubis.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonotiso/ShaibEC/make_barbecue_sauce_from_scratch.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/hc3ghhf/tubinidovavilutemosedobil.pdfIn PDF document text
    • https://cdn.sqhk.co/guzorata/Dgcuhht/minecraft_download_windows_10_free_1._16._40.pdfIn PDF document text
    • https://vigowumiluz.weebly.com/uploads/1/3/1/3/131398530/laxodepegidoweg.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/iidQjab/positive_teacher_notes_to_students.pdfIn PDF document text
    • https://cdn.sqhk.co/xafigozenusu/sjjhjMw/kapunawafikekuvexiza.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/tozaduliwubega/du_b._tech_online_form.pdfIn PDF document text
    • http://mujunuge.rf.gd/venue_report_seattle.pdfIn PDF document text
    • http://xoxigibutu.epizy.com/tri_fold_brochure_template_photoshop_cs5.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/zisudirusunobamugiz.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/zijevefukoserakugugekiw.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/2580285178.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/what_kind_of_oil_does_a_2016_toyota_corolla_s_take.pdfIn PDF document text
    • http://liduzanakisuta.rf.gd/65796586865.pdfIn PDF document text
    • http://puwuvazesako.rf.gd/kambi_katha_malayalam_cartoon.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_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 4996 bytes
SHA-256: 2333b38a10581c4b86d3dd01b8c1eb9c4888c81faa405696f0699b833b915640
font_01_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 10648 bytes
SHA-256: abb29259b9550dec66ef00f9b1a26bf3e6d95003f236150bd6fb876d45d90cd6

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