Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5652721621c8866…

MALICIOUS

PDF

77.7 KB Created: 2021-03-02 19:31:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 781401e6037bb0abad4590b4b497d826 SHA-1: 6cf9534fc878aee53dc6f8ebdec7a29a21f5c96b SHA-256: b5652721621c8866b957e5f59ad8ae3db1c70bef93c62da0b4ed7c40536ba653
126 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, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content or downloads. The document body, though heavily obfuscated, contains text related to downloading 'geometry dash 2.1 apk android', indicating a lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://jumiwimov.ru/wix?keyword=descargar+geometry+dash+2.1+apk+android PDF link annotation
    • http://aarbuz.space/96049733126r02zd.pdfIn PDF document text
    • http://rte-ita.fun/45435758596jznsz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_600d08c85e020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413590/normal_5fff83ec18040.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501027/normal_6006b2034998d.pdfIn PDF document text
    • http://maturibcgj.space/xalusogwtwr.pdfIn PDF document text
    • http://ideaita.fun/21334716936npk9q.pdfIn PDF document text
    • http://bristol-yalta.run/lixolewosofikedojizurt89sg.pdfIn PDF document text
    • http://agent-spv.space/judexisekoxepazanojfg2x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423171/normal_5fd77b6b2cc7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_6016cbf76450e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_6030195481158.pdfIn PDF document text
    • http://sedouche.xyz/dreamweaver_cs5_lite_portable_freewr1cy.pdfIn PDF document text
    • http://jesunekuben.22web.org/what_is_the_purpose_of_theme_for_english_b.pdfIn PDF document text
    • http://registrat.space/algorithms_4th_edition_4th_edition_by_robert_sedgewickzrtnx.pdfIn PDF document text
    • http://icily.xyz/gejepurudalethsjzb.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/free_3rd_grade_science_worksheetswkrm7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_602b97d92c290.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pejuxex.rf.gd/sql_programming_language_for_beginners.pdfIn PDF document text
    • http://sonituzesubilit.epizy.com/guidewire_tool_wiki.pdfIn PDF document text
    • http://zadavagex.rf.gd/computer_parts_near_me_now.pdfIn PDF document text
    • http://xamudakosenezi.rf.gd/nutrition_information_milk_kefir.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_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 5836 bytes
SHA-256: 3ae1a2d6565ec471e4bafff25afab33a6115e31e699046f282911d4b43c7a5a4
font_01_sfnt_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 10608 bytes
SHA-256: 0800b3de285e2c4811e2467f5e6ca3ad7dd5035106f055f69a3234faf3fae647

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