Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c92252e0085206…

MALICIOUS

PDF

80.7 KB Created: 2021-05-08 12:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47b84e86375aaf542b178e4e73c684d5 SHA-1: 8d392b3ea9d3a26c7ca4f6a69a10c577b5e75a05 SHA-256: 43c92252e0085206fe3e68ddbd8bbff6877f44fce7cf3881f3c8e2a62001654c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to disposable hosting domains, indicative of a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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://resalured.ru/strik?utm_term=how+to+help+a+student+with+a+hearing+impairment
    • https://ropidofizo.weebly.com/uploads/1/3/0/7/130738616/debazenebivekanat.pdf
    • http://naliputa.mywebcommunity.org/malipu.pdf
    • https://karomigotel.weebly.com/uploads/1/3/5/9/135962203/kizizusukixepogomedu.pdf
    • https://gupesasuxubigu.weebly.com/uploads/1/3/4/7/134717911/dewamabevel.pdf
    • http://mesikigodijope.mypressonline.com/livro_temperamentos_transformados_pelo_espirito.pdf
    • https://cdn-cms.f-static.net/uploads/4365594/normal_601b69a8c3391.pdf
    • https://mezonojasu.weebly.com/uploads/1/3/4/6/134639114/xabowazirop_vamefafot_jewobezor.pdf
    • https://cdn-cms.f-static.net/uploads/4415936/normal_5fd3204cd11a7.pdf
    • http://kizunawinim.getenjoyment.net/lokep.pdf
    • https://cdn-cms.f-static.net/uploads/4495395/normal_6018784e5e783.pdf
    • https://feposogasutam.weebly.com/uploads/1/3/1/3/131384530/884bd0c674.pdf
    • https://static.s123-cdn-static.com/uploads/4374851/normal_6000153debc9f.pdf
    • https://static.s123-cdn-static.com/uploads/4416671/normal_5fcbe832cab84.pdf
    • http://sejerodetupumil.medianewsonline.com/kerala_co_operative_bank_exam_syllabus_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4365547/normal_5fe5c738cd6e7.pdf
    • http://novubelugalij.medianewsonline.com/brachial_plexus.pdf
    • https://cdn-cms.f-static.net/uploads/4497650/normal_603ccd9da5b1b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tiwatimab.atwebpages.com/61859218700.pdf
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_876c83d9ef3849dba50a72dbb851a24f.pdf?index=true
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_fd03e1f3bf8049018feec991593e1378.pdf?index=true
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_79b0a1bec54644a7a8498ec91c3d5bac.pdf?index=true
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_09147b52aa7840ec804b91400d120a08.pdf?index=true
    • http://pofijiserige.onlinewebshop.net/jibew.pdf
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_0acb9feda14d4d60ad7993b88bb47677.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd77.bin
3f398f2465e74798003d04879fc7db48e2b84d9caa2b8792c07b969cdb632dd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 5428 bytes
font_01_sfnt_off00010fcd.bin
91450d647d479d1e0d9461ac06e2e68f9efd7b533ce9cd52bf6b35dd02abbbc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 10844 bytes

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