Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b41c43e8fb3b15a…

MALICIOUS

PDF

92.8 KB Created: 2021-04-08 23:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0679036259db609c7a18f0be8ff34d26 SHA-1: 57372c3ce8a56f2d1ead73398adfc2bdf763aab6 SHA-256: 3b41c43e8fb3b15a3447f12f3654685d0d8e2108af7bdddd84d90df19867a507
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://midufefew.ru/strik?utm_term=bhagavad+gita+ch+10+verse+42 PDF link annotation
    • https://cdn.sqhk.co/seponidozit/heHsgjJ/bts_dynamite_mv_views_in_24hrs.pdfIn PDF document text
    • http://fakaluwu.scienceontheweb.net/xiwutawasusotogusopusigex.pdfIn PDF document text
    • https://cdn.sqhk.co/dudumadopole/Zxihkha/fizifop.pdfIn PDF document text
    • http://milanomodaitaly.site/40343416144bzm1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459926/normal_6015e1ed3d2b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454561/normal_5fd31e4d0708a.pdfIn PDF document text
    • http://werenntaq.online/17448668602nkb83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487641/normal_601f32ee86f14.pdfIn PDF document text
    • http://creditstar-kabinet.com/rasogusefojoxuwjitbh.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/eeqigsL/100_hits_heavy_metal.pdfIn PDF document text
    • http://strapslap.online/18708394743ecbtm.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/fiiFjer/erebus_escape_room_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/soxaxojuxa/ga7ihjb/68926167327.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_fc346839d33b4b72b5f723ce93358feb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/71329200453.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/lenovo_g50-45_80e301n3in_notebook.pdfIn PDF document text
    • https://ed8cecbe-9888-40ab-9384-4b5b2efda5e6.filesusr.com/ugd/22dd42_d706a5dbe5f24cc4aa723368f767a650.pdf?index=trueIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_ac7860599b204cd3857c2058a7047869.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_60169c1a2b434737871910c0dde01660.pdf?index=trueIn PDF document text
    • http://wovuluvoju.onlinewebshop.net/wunowe.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.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 5692 bytes
SHA-256: ae56a3bfc3f8c447747ef2b4afece2eb6ceec825441f9476984495e27bf18920
font_01_sfnt_off00010e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E29 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off0001198c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198C 10552 bytes
SHA-256: 85b9bee9f632f65c64430118eedc7d04ce0d89246dd6860c6d50bf61e23c8260
font_03_sfnt_off00013dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDA 11656 bytes
SHA-256: 49313b83d8a3c023b45b0615f13d4fa215d44bcc0aa2d61d3ce8cf772eb85d09