Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae20f97909d0dd6a…

MALICIOUS

PDF

77.3 KB Created: 2021-04-19 03:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 96873bb02650168873d67f9094bdd853 SHA-1: 99afb272dbc7ab2a57f474cddc2e75e964c4ca61 SHA-256: ae20f97909d0dd6ae7efca8879c776aa5fa6b439e11a589a2f4a7f4cfd779368
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9997

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.
  • 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://maypoin.ru/strik?utm_term=how+much+weight+can+you+lose+on+a+3+day+egg+fast PDF link annotation
    • http://jazovez.iblogger.org/retinopatia_hipertensiva_elsevier.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_6033baf019aea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_606df375e2e65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463824/normal_60216c6f99568.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452834/normal_5ff350df4ee6a.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/WmXgfjb/passover_haggadah_short.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453129/normal_605dfaa55d496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406456/normal_602821b78411d.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/j04jije/554595247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_600cb402044aa.pdfIn PDF document text
    • http://varomevapaxobud.22web.org/377178995.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_0f8b7e22ee624cf382e2fff0e64f2e0a.pdf?index=trueIn PDF document text
    • https://4fbc56e1-d9a2-4996-be1d-38f9cd263936.filesusr.com/ugd/b1afee_9d40a10ea1f042c2bd33b57f2e076c67.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f109d3b5-0665-4916-9466-461b2a97605f/wokafeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516f6ccb-fc10-469f-9f19-8b82116f8086/nonisuvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33eab38d-fd6a-4a02-9e2c-0b404475782f/84667133146.pdfIn PDF document text
    • http://vowaderisosalel.epizy.com/woxonosix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b05343-96fb-4415-ba1e-4e9505eb2590/kwikset_909_smartcode_deadbolt_manual.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_94a8c12a3d9243d8abcfed829fa1019e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a391c031-a450-42f4-86c2-0ff05de56a2e/how_to_replace_samsung_chromebook_screen.pdfIn PDF document text
    • https://a93a1e1b-27ef-4877-b86e-8f07cc2ab01d.filesusr.com/ugd/1fa6dd_8e2345f778bb4b3f93c8bf0cd128ca74.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_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 5660 bytes
SHA-256: a31c2efe4bf6119a60cb3524fbba1d981c4a6b47f6c3ddf91684a2bd8e4680ec
font_01_sfnt_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 11180 bytes
SHA-256: 7072bec6f14f1aa07e27c9acc40a9649bd96bd568e53f0e1ddc7e5808843b2a0

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