Malicious PDF — malware analysis report

Static analysis result for SHA-256 21be878bea1b3269…

MALICIOUS

PDF

84.2 KB Created: 2021-05-16 11:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 36e2b408e7914b69cc995ded01692988 SHA-1: 1637edc8a30e67c0e5a33a6ed923309230183b48 SHA-256: 21be878bea1b326968a3deb5d0503b868a49f1b8340040de4587f082ec51e9ed
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on potentially malicious hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/strik?utm_term=what+are+the+doctrines+of+the+salvation+army PDF link annotation
    • http://itasda.online/24519434903tzo5g.pdfIn PDF document text
    • http://a-trvl.ru/identify_congruent_angles_worksheetoljyw.pdfIn PDF document text
    • http://funolodezesigit.iblogger.org/21733776182.pdfIn PDF document text
    • https://cdn.sqhk.co/buwowunuras/gqLhbeY/the_impossible_quiz_book_chapter_3_notdoppler.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/4HTjagm/start_my_own_kingdom_bannerlord.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_60174e0d305c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_606cd074b5c3a.pdfIn PDF document text
    • http://zotagur.22web.org/jurnal_bronkiolitis.pdfIn PDF document text
    • http://shopyou.online/stm32f103c8t6_arm_stm32luikz.pdfIn PDF document text
    • http://fazurusitu.getenjoyment.net/converter_software_free_download_to_word.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470222/normal_6061d963b6fa0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420459/normal_5fcafd1763fc3.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/G9jjvTZ/soferikekuzubenenotebovin.pdfIn PDF document text
    • http://mutedagagagexe.22web.org/72240105753.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/baseband_and_broadband_topology.pdfIn PDF document text
    • http://fuwiduwoxobol.mygamesonline.org/que_es_el_analisis_costo_beneficio.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/7ihgiha/42619127450.pdfIn PDF document text
    • http://topdiscount.pro/what_do_i_feed_my_green_tree_frogme2xb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zuwosil/como_hacer_estudios_biblicos_dinamicos.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/card_wars_adventure_time_redeem_codes_android.pdfIn PDF document text
    • http://vonizevugopu.rf.gd/vibagofibigenumox.pdfIn PDF document text
    • http://noxisalezupob.epizy.com/jurnal_geotropisme.pdfIn PDF document text
    • http://kipejefanowisu.atwebpages.com/25469489250.pdfIn PDF document text
    • http://kopolug.myartsonline.com/cambridge_igcse_computer_science_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 5224 bytes
SHA-256: c9c27c3375ada683917a257feff73d6fb6ca767a980969898e3aa7ebbe76f447
font_01_sfnt_off00011030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11030 10756 bytes
SHA-256: 8919c380b8c535348de97d782113d18d7312c169f729d04bfa275ab1b8abc8b4
font_02_sfnt_off000134b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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