Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe1522790677757…

MALICIOUS

PDF

79.9 KB Created: 2021-04-22 14:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3d29368fe3809369523fe0995799cf9b SHA-1: 557a188b908526745a5f331ea0384d65e41e5381 SHA-256: 0fe15227906777575be91191d7b5d3fca95a94a13e10e44fe14d79ac41a56de9
126 Risk Score

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 0.9993

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://leonvi.ru/strik?utm_term=cake+bible+carrot+cake+recipe PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459929/normal_6012191ec1ab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417139/normal_600bcb0ed40fd.pdfIn PDF document text
    • http://daimontimur.org/64453240746zzrjr.pdfIn PDF document text
    • http://aydym.club/11478827149997gz.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/what_is_the_meaning_of_the_negro_speaks_of_rivers.pdfIn PDF document text
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/vatukokivexaxo-satovi-sopajaboperemo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_605d7de216b56.pdfIn PDF document text
    • https://migobagola.weebly.com/uploads/1/3/4/8/134874333/28311f8cc57.pdfIn PDF document text
    • https://donezuzigomage.weebly.com/uploads/1/3/1/4/131438278/panusen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424689/normal_6069141f3a267.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482218/normal_5fe05bbb34ddf.pdfIn PDF document text
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/4151526.pdfIn PDF document text
    • https://dikivofugejal.weebly.com/uploads/1/3/1/4/131453076/a869ba7bc.pdfIn PDF document text
    • http://bizowokare.getenjoyment.net/6101675510.pdfIn PDF document text
    • http://trixy-matrix.space/does_procreate_come_with_ipad_7th_generation0crr5.pdfIn PDF document text
    • http://braco.ru/fe_review_manual_-_lindeburg_2010imutr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://79f67b98-100a-41ac-8a2f-4880133f117e.filesusr.com/ugd/f12c90_69f71faa88d9476a8307a91e30cab4f3.pdf?index=trueIn PDF document text
    • https://99d0733d-4d0e-4d19-b238-fea6f81017ca.filesusr.com/ugd/e32e4a_e60df289c6f94336b9123eaa0447f27f.pdf?index=trueIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_964780d130fa44b0b3e587ff9a15f2fe.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_eb09bb42ccd2496ba5d704a99c8c808b.pdf?index=trueIn PDF document text
    • https://37cc4ef3-276f-49d0-84f3-8bc08bbde6a9.filesusr.com/ugd/e4a5d4_f784555d72ca4b39a634465cef75b5c0.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_037d0e4443da4fefbf86157c04ae144a.pdf?index=trueIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_143a994129d84d9c803572a21dac6d27.pdf?index=trueIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_74d113811bc6448a9490aa437be9ef3b.pdf?index=trueIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_6268d5eabf184316948eee3201c0f0b7.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_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 4860 bytes
SHA-256: da6a6fac5e0e603f0cd22b7299d835f227aae097bb29f8ebc347369c2c080e4c
font_01_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 12268 bytes
SHA-256: f3656452421bf29934ffc054d3b3f724ba6be4056b85b8483c2d0223ee57e170