Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fe45e039480f94…

MALICIOUS

PDF

75.7 KB Created: 2021-03-12 12:02:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 01b1c8db2c20bbc130e64c2f4a9d4aaa SHA-1: a2ec8203706462de066142f72e38012b68b86eb6 SHA-256: e9fe45e039480f94cb4e4e3c426fb84f809896f6f040c4e92147baa6e9bd20d8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary purpose appears to be directing users to potentially malicious or unwanted content via these numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://xezojetit.ru/award?keyword=past+simple+verbs+exercise+pdf PDF link annotation
    • http://mevakimuvu.mypressonline.com/glencoe_6th_grade_science_textbook.pdfIn PDF document text
    • http://rabiwitijif.medianewsonline.com/tony_evans_kingdom_man_bible_study.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386354/normal_6035cc5e5a8e8.pdfIn PDF document text
    • https://wufipalowev.weebly.com/uploads/1/3/4/5/134595621/a80e5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408352/normal_603eeb29514f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402280/normal_5ffe7968a1b7e.pdfIn PDF document text
    • https://dexidexida.weebly.com/uploads/1/3/4/2/134235246/9744f6d95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469374/normal_5fcc026d3d40a.pdfIn PDF document text
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/5522295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444110/normal_6046d0332eddd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_601eb1cc99d2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_602377372484e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_9a9744eabf6145c8aebc0650826e19ca.pdf?index=trueIn PDF document text
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_ce901e717c0a4a4984f02ed54b6a915d.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_229a052ba59d4724bf1df8d75c75dcd2.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_1780f143b2b742d382aa4144784eca88.pdf?index=trueIn PDF document text
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_0a0df52205d94510b31bdb73f700112f.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_99d62c3701844d0fa838fa0a1adf488f.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_0c822a8ac8e646ff89c56a7db06a5c11.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_189205211fc74d65b4f63efd85b1a226.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 5572 bytes
SHA-256: 867e16417b307a249e2a257ed6c24de15917f906d96651ce738c8fa4e522ea7e
font_01_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 10424 bytes
SHA-256: e9950ac5e445165e0c03e643bed8ea044e069e954b32b7a8802d9f540ddb7cde