Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a9427b38fce8cb…

MALICIOUS

PDF

92.1 KB Created: 2020-12-24 17:50:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c3961c52641ee12e73f492adc6fed993 SHA-1: e33db1b09792d2e12c8101f1af617b91efde61a2 SHA-256: 40a9427b38fce8cb14ca4f466c133cde89804a25dad5a96ae5f72e92d9ba9213
136 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL designed to lure users into downloading a malicious file, masquerading as a Minecraft mod. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing and trojan activity. The primary IOC is the redirector URL used in the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffnew.ru/strik?utm_term=minecraft+mutant+creatures+mod+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413002/normal_5fa2003c1ca3c.pdfIn PDF document text
    • https://cdn.sqhk.co/xetasenuwoji/iBmhjEP/our_solar_system_is_a_collection_of.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481397/normal_5fa858b4801d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f890a3e9d945.pdfIn PDF document text
    • https://cdn.sqhk.co/kupovite/sjgzlgg/fanatical_basketball_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/gdSLzus/99833594776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389830/normal_5fb8c47d090d4.pdfIn PDF document text
    • https://cdn.sqhk.co/dujujema/PEhi2ic/best_sound_equalizer_app_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413468/normal_5fb3e620a62bd.pdfIn PDF document text
    • https://cdn.sqhk.co/dalogunutixo/Xnggphc/gorunetodozajuwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c560ab82-f426-45da-b9fb-486b7d5220d9/jasivajizukuzebanopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7c9c88-beab-4a7d-ae7b-b030c5fc8e78/kegijoboxedixegowut.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/direct_reported_speech_ks2_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/8754580790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79bfe2e0-5e8c-4bce-997f-aa1b864962c1/sonic_green_tea.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 3016 bytes
SHA-256: fd2e3381eae67f4c7fcebf164a8171a45157d0954041d1d900f2e75b0f5e8087
font_01_sfnt_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 5148 bytes
SHA-256: 026e60c76eb6824a49b67843feb127d9a662eadbc32af267d03f6fc7d5ed8e5a
font_02_sfnt_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 9372 bytes
SHA-256: aaf0f19fba9705deb5acf55a2932e72d080fe924dd5a5541440231554430ac83
font_03_sfnt_off000116de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DE 10976 bytes
SHA-256: e99c5800064e046945ae65da7839f33bb36dbf2459abc211098709afd5f93f57
font_04_sfnt_off00013c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5B 16236 bytes
SHA-256: 0bb806dabcadcb4bf8c6e4cb840fd9981809efc09a245ef646859fa90a5cd6af
font_05_sfnt_off000151bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BC 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230