Malicious PDF — malware analysis report

Static analysis result for SHA-256 108021a1048541f2…

MALICIOUS

PDF

80.5 KB Created: 2021-05-23 22:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fa2afd756df80a9c1892aa07c6bde92 SHA-1: dadfa2b954e55f07b2ae703637600023888e7def SHA-256: 108021a1048541f2990235a739fe349b3f0f90d62e8862fb72b9fd1a7409b0a7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to potentially malicious domains, suggesting it functions as a link farm or a lure for phishing. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious sites, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=11.s%25C4%25B1n%25C4%25B1f+kimya+ders+kitab%25C4%25B1+%25C3%25A7%25C3%25B6z%25C3%25BCmleri+e+kare+yay%25C4%25B1nlar%25C4%25B1
    • https://static.s123-cdn-static.com/uploads/4454821/normal_5fee632dae112.pdf
    • https://mofumamivuzav.weebly.com/uploads/1/3/1/0/131070192/7927336.pdf
    • https://sixuvowapunara.weebly.com/uploads/1/3/0/7/130738553/1424486.pdf
    • https://guvikaki.weebly.com/uploads/1/3/4/5/134519546/4420291.pdf
    • https://cdn-cms.f-static.net/uploads/4409102/normal_604d4150c9921.pdf
    • https://sileperu.weebly.com/uploads/1/3/1/4/131406390/kozuwelija_lefakafadewez_vifowasebada_savumitogawenek.pdf
    • https://static.s123-cdn-static.com/uploads/4422884/normal_5ff5be9fdbcc0.pdf
    • https://static.s123-cdn-static.com/uploads/4474465/normal_5fe49ffc9c9db.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zumomasugipeno/activities_for_very_young_learners.pdf
    • https://s3.amazonaws.com/wizuluworafid/iphone_5s_battery_price_apple_store.pdf
    • https://s3.amazonaws.com/dikomavomem/mixture_problems_examples_with_answers.pdf
    • https://s3.amazonaws.com/dalava/rosonedirilur.pdf
    • https://s3.amazonaws.com/wapabefizosumi/aimersoft_drm_media_converter_crack.pdf
    • https://s3.amazonaws.com/juzowilipi/60791866987.pdf
    • https://s3.amazonaws.com/xafaxotaful/lady_windermeres_fan.pdf
    • https://s3.amazonaws.com/tubupejevomo/scope_of_work_social_media_marketing_template.pdf
    • https://uploads.strikinglycdn.com/files/27214249-d5bc-49d0-9d0c-d69e64e96f0f/galudekipo.pdf
    • https://uploads.strikinglycdn.com/files/b8ee5121-1571-4199-8d82-8569d0d0901f/vizio_m50_c1.pdf
    • https://s3.amazonaws.com/tufitijinexu/hopedale_la_fishing_report.pdf
    • https://s3.amazonaws.com/petubapizo/fopobof.pdf
    • https://s3.amazonaws.com/dozuga/paper_referee_report_sample.pdf
    • https://s3.amazonaws.com/dutimajizowa/59352159424.pdf
    • https://uploads.strikinglycdn.com/files/084e0492-4983-4e5e-adeb-a0b025c6ef7f/jedi_apprentice_the_rising_force.pdf
    • https://s3.amazonaws.com/ropidadegaxut/kogobi.pdf
    • 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_off0000d889.bin
a927d7915a3570c0f23d0661370e0a4ddbd3ec16f7477729a530930837c9ba37
pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 8692 bytes
font_01_sfnt_off0000f5ec.bin
a1f41e2448783e9e12372dc664e904a01d5a36214a48c0c0d9df2ab288ae16b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 5872 bytes
font_02_sfnt_off0001096e.bin
08ff2c8faf4903c1ca17df20a12fe01351fe05b6353f6cce197329210230bb2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 12152 bytes