Malicious PDF — malware analysis report

Static analysis result for SHA-256 278f2e2c6d02dcba…

MALICIOUS

PDF

95.5 KB Created: 2021-05-28 22:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 59cbf8b4db0f52388ff65b5cfe620102 SHA-1: 4bad631aabfb3d48c682a4aa2613c6cd29add8f6 SHA-256: 278f2e2c6d02dcbadd82ab6e206d90ada040b6ac9f24fd00d684a0bb95fb8509
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://botokaw.ru/123?utm_term=buscar+informacion+de+personas+por+dni+peru PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465565/normal_5ff2498e360c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401972/normal_6042f61de2f0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481417/normal_5fcb9e74e8b16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462993/normal_60150d14ab626.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385410/normal_600552fdcfcaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_60699dea55d42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421036/normal_600a213a67657.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_5fc98b2eb1bac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465907/normal_5fe2a6c9981bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476015/normal_5fd9370e0c7de.pdfIn PDF document text
    • https://wagebesalumiral.weebly.com/uploads/1/3/4/8/134846814/jitinomuburo-noxuzavimufad-wewebi.pdfIn PDF document text
    • https://wozomeki.weebly.com/uploads/1/3/0/7/130776066/e60b0364fe0b8.pdfIn PDF document text
    • https://kuxijixa.weebly.com/uploads/1/3/4/8/134856984/3596062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_604319819b9cd.pdfIn PDF document text
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/gekuta_vujubadikuxur_mubad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456140/normal_6014f3655f9c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee635ceb-1e14-4690-8458-bbf9ce63e910/bizipog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e36410c-ac68-4f83-a517-261af8137308/66777112213.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 6832 bytes
SHA-256: 8ffa0a7012bdbc979f05a63d7f75e73875829669dce55cdcbc4c4d8d4cc6eb8f
font_01_sfnt_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 5320 bytes
SHA-256: 278050cf9b3fae4f2e52d31b1f8824641629d01dc1953246f6ffdc20b059964c
font_02_sfnt_off00011bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 4516 bytes
SHA-256: 7d228f90e44c0c853f6c0b58851ebe05159d38b169620006aa576a7ccc378747
font_03_sfnt_off00012cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDB 12572 bytes
SHA-256: e39bc71ed98d4556c474a1ab82973effa04d9d659a3d8780a42a4fb7d5d093ba
font_04_sfnt_off00015582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15582 16892 bytes
SHA-256: 3c4eb344dc156e40d182e629bfad2aee7d9de4f62883fdc23727218111fd0ecc

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