Malicious PDF — malware analysis report

Static analysis result for SHA-256 de891205793545cf…

MALICIOUS

PDF

75.4 KB Created: 2021-04-03 20:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5ee771a6fafcc532ef3eeff5a790387 SHA-1: 10d367f5d862dc1c7518bf7f2c84e8f41f31ccba SHA-256: de891205793545cf98a590b42d36bdfee1948376516c60c9c86b8075b30305dc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO poisoning or phishing campaigns to redirect users to malicious sites. The heuristic PDF_SEO_LINK_FARM specifically indicates a mass of external links, with one pointing to 'https://s3.amazonaws.com/boduxatavepe/kabar.pdf'. The embedded URL 'https://jacksth.ru/wix?keyword=cub+scout+handbooks+online' suggests a lure related to online handbooks. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=cub+scout+handbooks+online
    • http://artistichomesolutions.com/caracteristicas_del_sistema_politico_mexicano_de_1940_a_1988q4qv3.pdf
    • http://ecoterritory.store/is_maths_degree_harder_than_engineeringlydrx.pdf
    • http://beststudent.space/wozosuketfrqoh.pdf
    • http://expressday.online/99519357014b35fa.pdf
    • http://reawolt.online/polaris_magnum_425_oil_capacityubyb9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/boduxatavepe/kabar.pdf
    • https://uploads.strikinglycdn.com/files/3bda5ac2-91d7-41f9-9cdb-5a90020e7f2b/88134125351.pdf
    • https://s3.amazonaws.com/ruzaganog/college_graduate_resume_template_free.pdf
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_79659a8aceff4d3ab6a2a80b24be1a7f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/75b5ae0a-680a-42ba-a7b6-cb71de143070/how_to_get_trade_options_on_robinhood.pdf
    • https://s3.amazonaws.com/zuponefi/did_jack_die_in_jack_and_the_cuckoo_clock_heart.pdf
    • https://s3.amazonaws.com/tuxenipup/pdf_file_resize_i_love.pdf
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_4a6daf73b16f4d82b644ad30da114bdc.pdf?index=true
    • https://s3.amazonaws.com/wopari/building_construction_ppt.pdf
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_49454001f9bb4b14843c8a71a54381e2.pdf?index=true
    • https://s3.amazonaws.com/lomiwexuva/how_to_delete_facebook_account_mobile_2020.pdf
    • https://s3.amazonaws.com/jivagajamav/apc_be550g_specs.pdf
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_5486924972bf4dd0abd30a31e11e8fbb.pdf?index=true
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_cef8bb39cb124ff1a88e122c1ad10b36.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf4.bin
2f94e3b1fec825943d939422caf2d142bffac4f0b08a8b44ef0958c02596b69e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 5040 bytes
font_01_sfnt_off0000ed04.bin
b6e361d3c7442a07e00fab0b4c53afed07a5242193f5970becd4c9c9d2c70b8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 10964 bytes
font_02_sfnt_off0001125e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125E 4324 bytes