Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e97ba919e3fd43…

MALICIOUS

PDF

78.2 KB Created: 2021-04-01 08:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0f15294ba95b70603e56f2a3c657ac7d SHA-1: 7f6aca1ce333b405acd8a786e09704749b14254b SHA-256: e5e97ba919e3fd4350b98063b844022ca5a387da76a91d64c5ea165f110490c2
106 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it functions as a link farm, directing users to external websites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests a common tactic of encrypting payloads and providing instructions to bypass gateway security. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jacksth.ru/wix?keyword=dogfight+3+unblocked PDF link annotation
    • http://freefire-gifts.com/pulixigonujejoxoti0uq3q.pdfIn PDF document text
    • https://cdn.sqhk.co/gikokimofegi/jgz5jjg/sirocco_boat_charter_price.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/5Mijjbs/average_monthly_cost_for_obamacare.pdfIn PDF document text
    • https://cdn.sqhk.co/vemunaxudug/agdiET0/nobevus.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/83177943450f6w3e.pdfIn PDF document text
    • http://cenderaoriginator.com/sony_ht-xt100_problemsqegfx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_d35d069f63ad463f83b860d10776cff0.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_ea9e72f3ff2a4588b265fa51ad94019e.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_89def48e016f4e35a17ddbb2d49d0257.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/bharathiyar_songs_masstamilan.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_8eb350a395d247a6beab9ff2d3793d2f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/492d6a28-6472-4202-967a-6720bcb7dcf6/41755188000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e3bde0-cd15-4a4e-b616-05dbaae9c179/fojumafu.pdfIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_823ddb9a9bf54d8a925297a014d2b779.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rumezo/mailjet_api_template.pdfIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_61c98723a6fe4488b35a8d8b982d90f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xisefowu/64657685160.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_63669ae495ff430f9cb971118b3a90e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/food_elimination_diet_guide.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 5164 bytes
SHA-256: c9dbed863fb888ec911c97c6a3de3cb8aa9a5ae27e3d6a5c6c61d1409d286fb9
font_01_sfnt_off000104dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 11240 bytes
SHA-256: 03064979ca24194a18b8b8c32c2e891fd73a196b4db037552b0df199f8a5c582

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